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Chapter 1 - Network Fundamentals Flashcards

1
Q

Which statement is a valid reason the OSI reference model was created?

A. It encourages vendors to create proprietary standards for any component of the
OSI.
B. It allows for changes on one layer to apply to another layer so they can work together.
C. It prevents industry standardization of network processes.
D. It divides network communication into smaller components for design and troubleshooting.

A
  1. D. The OSI reference model was created to divide the network communication process into smaller components for standardization, design, and troubleshooting purposes. It also allows for a nonproprietary standardization of components and prevents a change at one layer from affecting other layers.
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2
Q

When a program uses encryption such as SSL, which layer is responsible? A. Presentation layer
B. Transport layer
C. Data Link layer
D. Session layer

A
  1. A. The Presentation layer is responsible for encryption and decryption. Web servers use SSL to encrypt data and the client uses SSL to decrypt the data. SSL processing for both server and client is done at the Presentation layer.
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3
Q
  1. Which device would primarily function at the Data Link layer?
    A. Routers B. Firewalls C. Gateways
    D. Switches
A
  1. D. Switches primarily function at the Data Link layer. They inspect frames to direct traffic to the appropriate port by employing source MAC address learning and forward/filter decisions.
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4
Q

Which is the proper order of the OSI layers?
A.Application,Transport,Session,Presentation,Network,DataLink,Physical B. Presentation,Application,Session,Transport,Network,DataLink,Physical C. Application,Presentation,Session,Transport,Network,DataLink,Physical D. Application,Presentation,Transport,Network,Session,DataLink,Physical

A
  1. C. A simple way of remembering the order of the OSI layers is with a mnemonic such as All People Seem To Need Drinking Parties or All People Seem To Need Data Processing.
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5
Q
  1. Which OSI layer is responsible for logical addressing? A. Transport layer
    B. Network layer
    C. Application layer
    D. Data Link layer
A
  1. B. The Network layer is responsible for logical addressing. Routers use logical addressing for path determination to remote networks the same way the post office uses zip codes and street addresses to route mail.
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6
Q
  1. Which OSI layer is responsible for connection-oriented communication?
    A. Transport layer
    B. Presentation layer C. Data Link layer
    D. Application layer
A
  1. A. Connection-oriented communication happens at the Transport layer with TCP. TCP uses a three-way handshake to establish a connection. Once it is established, sequences and acknowledgments make sure that data is delivered. Both server and client have a virtual circuit during the establishment.
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7
Q
  1. Which layer is responsible for compression and decompression?
    A. Application layer B. Physical layer
    C. Session layer
    D. Presentation layer
A
  1. D. The Presentation layer is responsible for compression and decompression. Compression methods can be MP3, JPG, and ZIP, which reduce the number of bits that need to be transmitted over the network. Often web servers use gzip to speed up page delivery. One end compresses and the other end decompresses the data.
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8
Q
  1. Which layer of the OSI is responsible for dialog control of applications? A. Application layer
    B. Physical layer C. Session layer
    D. Network layer
A
  1. C. Applications are found in the upper three layers and dialog control is found in the session layer. An example of dialog control is how an application such as instant messaging sends messages with half-duplex conversations like a walkie-talkie.
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9
Q
  1. At which layer of the OSI can you find DTE and DCE interfaces?
    A. Application layer B. Physical layer
    C. Session layer
    D. Transport layer
A
  1. B. DTE and DCE interfaces are defined at the Physical layer. The original interfaces referred to computers and modems, respectively. However, today the DTE and DCE interfaces define the equipment such as hosts and switches, respectively.
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10
Q
  1. At which DoD model layer does Telnet, TFTP, SNMP, and SMTP function?
    A. Host-to-Host layer
    B. Process/Application layer C. Internet layer
    D. Network Access layer
A
  1. B. Telnet, TFTP, SNMP, and SMTP all function at the Process/Application layer according to the DoD model. The Process/Application layer is a macro layer combining the Application, Presentation, and Session layers of the OSI model.
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11
Q
  1. An administrator is checking to make sure that SNMP is working properly. Which is the highest layer checked in the OSI if it is working successfully?
    A. Application layer B. Presentation layer C. Session layer
    D. Network layer
A
  1. A. Since SNMP is an application, if it returns back successfully, then we can conclude that the Application layer on the client successfully made a connection to the Application layer on the server.
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12
Q
  1. The receiving computer checked the checksum of a frame. It had been damaged during transfer, so it is discarded. At which layer of the OSI did this occur?
    A. Physical layer B. Data Link layer C. Network layer
    D. Session layer
A
  1. B. The Data Link layer is responsible for checking the FCS, or Frame Checking Sequence, which is a checksum of the frame. This occurs on the MAC sublayer of the Data Link layer.
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13
Q 
13. Which layer in the DoD model is responsible for routing?
A. Host-to-Host layer
B. Process/Application layer
C. Internet layer
D. Network Access layer
A
  1. C. The Internet layer of the DoD model maps to the Network layer of the OSI model. The Network layer is where routing occurs.
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14
Q
  1. Which devices create collision domains, raising effective bandwidth? A. Firewalls
    B. Hubs
    C. Routers
    D. Switches
A
  1. D. Switches create collision domains by isolating the possibility of a collision to the segment it is transmitting to or receiving frames from. This in turn raises effective bandwidth for the rest of the segments.
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15
Q
  1. Which device acts like a multiport repeater?
    A. Firewall B. Hub
    C. Router
    D. Switch
A
  1. B. A hub is a multiport repeater. When a hub receives a frame, it will repeat the frame on all other ports, regardless of whether or not the port is the destination host.
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16
Q
  1. Which layer of the OSI defines the PDU, or protocol data unit, of segments?
    A. Application layer B. Session layer
    C. Network layer
    D. Transport layer
A
  1. D. The segment PDU is found at the Transport layer of the OSI. TCP/IP comprises two protocols at this layer: TCP and UDP, which create segments.
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17
Q
  1. Which device will create broadcast domains and raise effective bandwidth?
    A. Firewall B. Hub
    C. Router
    D. Switch
A
  1. C. A router will stop broadcasts by default. If you add a router to a flat network, which is a single broadcast domain, you effectively raise bandwidth by reducing the number of broadcasts
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18
Q
  1. Which is a correct statement about MAC addresses?
    A. Organizationally unique identifiers (OUIs) create a unique MAC address. B. The first 24 bits of a MAC address is specified by the vendor.
    C. The IEEE is responsible for MAC address uniqueness.
    D. If the I/G bit is set to 1, then the frame identifies a broadcast or multicast.
A
  1. D. When the Individual/Group (I/G) high order bit is set to 1, the frame is a broadcast or a multicast transmission. The OUI assigned by the IEEE is only partially responsible for MAC uniqueness. The vendor is responsible for the last 24 bits of a MAC address
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19
Q 
19. Which access/contention method is used for Ethernet?
A. CSMA/CA 
B. CSMA/CD
C. 802.2
D. Token passing
A
  1. B. Carrier Sense Multiple Access/Collision Detection (CSMA/CD) is a contention method that allows multiple devices to share the access media and detect collisions of frames.
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20
Q
  1. What is the correct order of encapsulation?
    A. Userdatagrams,packets,segments,frames,bits
    B. Userdatagrams,sessions,segments,packets,frames,bits
    C. Userdatagrams,segments,packets,frames,bits
    D. Bits,frames,sessions,packets,userdatagrams
A
  1. C. The correct order of encapsulation starting with the Application layer is user datagrams, segments, packets, frames, and bits.
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21
Q
  1. Which application provides terminal emulation over a network?
    A. SNMP B. Telnet C. HTTP
    D. TFTP
A
  1. B. Telnet is used for terminal emulation over a network to a device expecting terminal emulation, such as a router or switch.
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22
Q
  1. Which protocol is responsible for identifying upper-layer network protocols at the Data Link layer?
    A. LLC B. MAC C. 802.3
    D. FCS
A
  1. A. Logical Link Control (LLC) is responsible for identifying network protocols at the Data Link layer. This allows the Data Link layer to forward the packet to the appropriate upper-layer protocol.
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23
Q
  1. The translation of ASCII to EBCDIC is performed at which layer of the OSI?
    A. Application layer B. Session layer
    C. Presentation layer
    D. Data Link layer
A
  1. C. The Presentation layer is responsible for translation such as ASCII to EBCDIC. All translation, encryption/decryption, and compression/decompression happens at the Presentation layer.
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24
Q 
24. Which is not a common cause for LAN congestion?
A. Broadcasts
B. Multicasts
C. Adding switches for connectivity
D. Using multiple hubs for connectivity
A
  1. C. Broadcasts, multicasts, and multiple hubs for connectivity are all common causes of LAN congestion. Adding switches for connectivity has no direct relationship to LAN congestion, since switches create collision domains and raise effective bandwidth.
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25
25. Flow control can be found at which layer of the OSI? A. Transport layer B. Network layer C. Data Link layer D. Session layer
25. A. The Transport layer is responsible for flow control via the TCP/IP protocols of TCP and UDP.
26
26. Which protocol requires the programmer to deal with lost segments? A. SSL B. TCP C. UDP D. NMS
26. C. User Datagram Protocol (UDP) does not guarantee segments are delivered. Therefore, the programmer must account for segments that are never received or out of order.
27
27. Which is a correct statement about the Transmission Control Protocol (TCP)? A. TCP is a connectionless protocol. B. TCP allows for error detection and correction. C. TCP is faster than UDP. D. TCP allows for retransmission of lost segments
27. D. TCP is a connection-based protocol via the three-way handshake. It is not faster than UDP. However, it allows for the retransmission of lost segments because of sequences and acknowledgments.
28
28. Which statement correctly describes what happens when a web browser initiates a request to a web server? A. The sender allocates a port dynamically above 1024 and associates it with the request. B. The receiver allocates a port dynamically above 1024 and associates it with the request. C. The sender allocates a port dynamically below 1024 and associates it with the request. D. The receiver allocates a port dynamically below 1024 and associates it with the request.
28. A. The sender allocates a port dynamically above 1024 and associates it with the request through a process called a handle. This way if a web browser creates three requests for three different web pages, the pages are loaded to their respective windows.
29
29. Which protocol and port number is associated with SMTP? A. UDP/69 B. UDP/25 C. TCP/69 D. TCP/25
29. D. The Simple Mail Transfer Protocol (SMTP) uses TCP port 25 to send mail.
30
30. How does TCP guarantee delivery of segments to the receiver? A. Via the destination port B. TCPchecksums C. Window size D. Sequence and acknowledgment numbers
30. D. TCP guarantees delivery of segments with sequence and acknowledgment numbers. At the Transport layer, each segment is given a sequence number that is acknowledged by the receiver.
31
31. When a programmer decides to use UDP as a transport protocol, what is a decision factor? A. Redundancy of acknowledgment is not needed. B. Guaranteed delivery of segments is required. C. Windowing flow control is required. D. A virtual circuit is required
31. A. When a programmer decides to use UDP, it is normally because the programmer is sequencing and acknowledging datagrams already. The redundancy of acknowledgments at the Transport layer is not needed.
32
32. Which mechanism allows for programs running on a server (daemons) to listen for requests through the process called binding? A. Headers B. Port numbers C. MAC address D. Checksums
32. B. When a daemon or server process starts, it binds to a port number on which to listen for a request. An example is when a web server binds to the port number of TCP/80.
33
33. Which is a correct statement about sliding windows used with TCP? A. The window size is established during the three-way handshake. B. Sliding windows allow for data of different lengths to be padded. C. It allows TCP to indicate which upper-layer protocol created the request. D. It allows the router to see the segment as urgent data.
33. A. The window size, which is a buffer, is established and agreed upon by the sender and receiver during the three-way handshake.
34
34. Why does DNS use UDP? A. DNS requires acknowledgment of the request for auditing. B. The requests require flow control of UDP. C. DNS requests are usually small and do not require connections setup. D. DNS requires a temporary virtual circuit.
34. C. DNS requests are usually small and do not require the overhead of sequence and acknowledgment of TCP. If a segment is dropped, the DNS protocol will ask again
35
``` 35. What is required before TCP can begin sending segments? A. Three-way handshake B. Port agreement C. Sequencing of segments D. Acknowledgment of segments ```
35. A. A three-way handshake is required between sender and receiver before TCP can begin sending traffic. During this three-way handshake, the sender’s window buffer size is synchronized with the receiver’s window buffer size.
36
36. Which term describes what it is called when more than one wireless access point (WAP) covers the same SSID? A. Broadcast domain B. Basic service set C. Extendedserverset D. Wireless mesh
36. C. When more than one WAP covers the same SSID, it is called an extended service set (ESS). A wireless LAN (WLAN) controller coordinates the cell or coverage area so the same SSID is on two different channels.
37
37. Which protocol allows a Lightweight AP (LWAP) to forward data to the wired LAN? A. Spanning Tree Protocol (STP) B. Bridge protocol data units (BPDUs) C. Orthogonal Frequency Division Multiplexing (OFDM) D. Control and Provisioning of Wireless Access Points (CAPWAP)
37. D. Control and Provisioning of Wireless Access Points is a protocol that’s responsible for provisioning of LWAPs and forwarding of data to the wireless LAN controller.
38
``` 38. Which component allows wireless clients to roam between access points and maintain authentication? A. Basic service set B. Extended service set C. Wireless LAN controller D. Service set ID ```
38. C. The wireless LAN controller (WLC) is responsible for centralized authentication of users and/or computers on a wireless network. When a wireless device is roaming, the WLC is responsible for maintaining the authentication between access points
39
39. Which is a valid reason to implement a wireless LAN controller (WLC)? A. Centralizedauthentication B. The use of autonomous WAPs C. Multiple SSIDs D. Multiple VLANs
39. A. Centralized authentication of clients is a valid reason to implement a WLC. Although a WLC makes it easier to implement multiple SSIDs and VLANs, this task can be performed with autonomous WAPs, each performing its own authentication.
40
``` 40. You require a density of 100 wireless clients in a relatively small area. Which design would be optimal? A. Autonomous WAPs with a WLC B. Lightweight WAPs with a WLC C. Autonomous WAPs without a WLC D. Lightweight WAPs without a WLC ```
40. B. To achieve density and/or bandwidth in a relatively small area, you will need to deploy lightweight WAPs with a WLC. Although autonomous WAPs without a WLC would work, it would be problematic due to frequency coordination and roaming.
41
41. When designing a wireless network, which would be a compelling reason to use 5 GHz? A. 5 GHz can go further. B. 5 GHz allows for more clients. C. There are 24 non-overlapping channels. D. There is less interference on 5 GHz.
41. C. The 5 GHz band for 802.11 a/n/ac has 24 non-overlapping channels. The 2.4 GHz band for 802.11 b/g/n has only 3 non-overlapping channels. If the clients are compatible with 802.11 a/n/ac, it is desirable to use 5 GHz
42
42. Which allows for seamless wireless roaming between access points? A. Single SSID B. Single service set C. 802.11ac D. Wireless LAN controller
42. D. A wireless LAN controller keeps track of which LWAP a client has associated to and centrally forwards the packets to the appropriate LWAP.
43
43. In the 2.4 GHz spectrum for 802.11, which channels are non-overlapping? A. Channels1,3,and11 B. Channels1,3,and6 C. Channels1,6,and11 D. Channels 1 through 6
43. C. In the 2.4 GHz spectrum for 802.11, there are three non-overlapping channels— 1, 6, and 11, each of which is 22 MHz wide. Although channel 14 technically is non- overlapping, it is only allowed in Japan.
44
44. Which is one of the critical functions that a wireless LAN controller performs? A. Allows autonomous WAPs B. Synchronizes the WAPs with the same IOS C. Triangulates users for location lookups D. Allows for the use of all frequency channels
44. B. When WAPs are introduced to the wireless LAN controller, the WLC is responsible for synchronizing the WAPs to a standardized IOS. This allows for uniform support and features of the wireless system and is dependent on the model of WAP.
45
45. Which is the contention method 802.11 wireless uses? A. CSMA/CA B. CSMA/CD C. BSSS D. OFDM
45. A. 802.11 uses a contention method of Carrier Sense Multiple Access/Collision Avoidance. 802.11 implements a Request to Send/Clear to Send mechanism that avoids collisions.
46
46. When firewalls are placed in a network, which zone contains Internet-facing services? A. Outside zone B. Enterprise network zone C. Demilitarizedzone D. Inside zone
46. C. The demilitarized zone (DMZ) is where Internet-facing servers/services are placed.
47
47. According to best practices, what is the proper placement of a firewall? A. Only between the internal network and the Internet B. At key security boundaries C. In the DMZ D. Only between the DMZ and the Internet
47. B. Firewalls should always be placed at key security boundaries, which can be the Internet and your internal network. However, proper placement is not exclusive to the boundaries of the Internet and internal networks. For example, it could be placed between two internal networks, such as R&D and guest networks.
48
48. Which is a false statement about firewalls? A. Firewalls can protect a network from external attacks. B. Firewalls can protect a network from internal attacks. C. Firewalls can provide stateful packet inspection. D. Firewalls can control application traffic.
48. B. Firewalls cannot provide protection from internal attacks on internal resources. They are designed to protect networks from external attacks or attacks emanating from the outside or directed toward the Internet.
49
49. Which of the following options is not a consideration for the management of a firewall? A. All physical access to the firewall should be tightly controlled. B. All firewall policies should be documented. C. Firewall logs should be regularly monitored. D. Firewalls should allow traffic by default and deny traffic explicitly.
49. A. All physical access to a firewall should be controlled tightly so that it is not tampered with, which could allow external threats to enter the network. This control should include vendors and approved administrators. Physical access to the firewall is a security principal and therefore not a consideration for the management of a firewall.
50
50. What is the reason firewalls are considered stateful? A. Firewalls keep track of the zone states. B. Firewalls keep accounting on the state of packets. C. Firewalls track the state of a TCP conversation. D. Firewalls transition between defense states.
50. C. Firewalls keep track of the TCP conversation via the SYN-SYN/ACK-ACK three- way handshake. This is done so that a DoS attack such as a SYN flood can be mitigated.
51
51. You have an Adaptive Security Appliance (ASA) and two separate Internet connections via different providers. How could you apply the same policies to both connections? A. Place both connections into the same zone. B. Place each connection into an ISP zone. C. Apply the same ACL to both of the interfaces. D. Each connection must be managed separately.
51. A. ASA allow for zones to be created and the connections applied to the zones. This methodology allows for security rules to be applied uniformly to the outside zone.
52
52. Why should servers be placed in the DMZ? A. So that Internet clients can access them B. To allow access to the Internet and the internal network C. To allow the server to access the Internet D. To restrict the server to the Internet
52. B. Servers should be placed in the DMZ so they can access both the inside zone and outside zone. This will allow a server such as a web server to allow client access from the Web (outside). Rules could also be applied so that the server (for example, a database server) could allow access to data from within the internal network (inside
53
53. Which type of device will detect but not prevent unauthorized access? A. Firewall B. IPS C. IDS D. Honey pots
53. C. An IDS, or intrusion detection system, will detect unauthorized access. However, it will not prevent unauthorized access. It is a form of audit control in a network.
54
54. When a firewall matches a URI, it is operating at which layer? A. Layer7 B. Layer5 C. Layer4 D. Layer3
54. A. When a firewall matches a Uniform Resource Identifier (URI), such as a URL, it is operating at layer 7. This is known as a web application firewall, or WAF.
55
55. In which zone should an email server be located? A. Inside zone B. Outside zone C. DNSzone D. DMZ
55. D. Since the email server needs access to the Internet to send and receive mail, it should be placed in the demilitarized zone (DMZ). This will also allow access to internal clients in the inside zone.
56
56. Amazon Web Services (AWS) and Microsoft Azure are examples of what? A. Publiccloudproviders B. Private cloud providers C. Hybridcloudproviders D. Dynamiccloudproviders
56. A. AWS and Microsoft Azure are examples of public cloud providers. Private clouds are internally created, and hybrid clouds are a combination of services between your private cloud and the public cloud.
57
57. You are looking to create a fault tolerant colocation site for your servers at a cloud provider. Which type of cloud provider would you be searching for? A. PaaS B. IaaS C. SaaS D. BaaS
57. B. If you were looking to create a fault tolerant colocation site as a cloud provider, you would be searching for an Infrastructure as a Service provider. This would allow you to install your own operation system and applications.
58
58. Which allows for the distribution of compute resources such as CPU and RAM to be distributed over several operating systems? A. Physical server B. Hypervisor C. Virtual machine D. Virtual network
58. B. The hypervisor allows for multiple operating systems to share CPUs, RAM, network, and storage of a physical server.
59
59. Which option describes a virtual machine (VM) best? A. An operating system that is running directly on hardware B. An operating system that is running with dedicated hardware C. An operating system that is running on reduced hardware features D. An operating system that is decoupled from the hardware
59. D. A virtual machine, or VM, is an operating system that is running on hardware but is not directly attached to the hardware. It is decoupled from the hardware through the use of a hypervisor. The hypervisor creates an abstraction layer between the hardware and the operating system.
60
``` 60. What is the physical hardware used in virtualization called? A. Host B. VM C. Hypervisor D. Guest ```
60. A. The physical hardware (such as a server) used in virtualization is the host.
61
``` 61. Which component connects the virtual machine NIC to the physical network? A. vNIC B. Trunk C. Virtual switch D. NX-OS ```
61. C. A virtual switch connects the virtual machine NIC to the physical network.
62
62. Which component acts as a distribution switch for the physical data center? A. Top of Rack switch B. End of Row switch C. Core switch D. Virtual switch
62. B. The End of Row (EoR) switch acts as a distribution switch for the Top of Rack (ToR) switches.
63
63. Which is not a NIST criteria for cloud computing? A. Resource pooling B. Rapidelasticity C. Automatedbilling D. Measuredservice
63. C. Automated billing is not a NIST criteria for cloud computing. It is essential for the cloud computing vendor, but is not relevant if you are hosting it yourself. The five NIST criteria for cloud computing are on-demand self-service, broad network access, resource pooling, rapid elasticity, and measured service.
64
64. Which term describes an internal IT department hosting virtualization for a company? A. Public cloud B. Elastic cloud C. Private cloud D. Internal cloud
64. C. When an internal IT department hosts the virtualization for a company, it is called a private cloud.
65
65. What is the role of a cloud services catalog? A. It defines the capabilities for the cloud. B. It defines the available VMs for creation in the cloud. C. It defines the available VMs running in the cloud. D. It defines the drivers for VMs in the cloud.
65. B. A cloud services catalog satisfies the self-service aspect of cloud computing. It does this by listing all of the available VMs that can be created in the cloud environment, such as web servers, application server, databases, and so on.
66
66. A hosted medical records service is an example of which cloud model? A. PaaS B. IaaS C. SaaS D. BaaS
66. C. A hosted medical records service is an example of a SaaS, or Software as a Service, model. The customer cannot choose variables such as vCPU or RAM. The cloud provider is responsible for the delivery of the software, maintenance of the OS, and maintenance of the hardware.
67
67. A hosted environment that allows you to write and run programs is an example of which cloud model? A. PaaS B. IaaS C. SaaS D. BaaS
67. A. A hosted service that allows you to develop upon it is an example of the Platform as a Service (PaaS) model. The cloud provider is responsible for the delivery of APIs that developers can use to create programs.
68
``` 68. Which cloud connectivity method allows for seamless transition between public clouds? A. MPLSVPN B. Internet VPN C. Intercloudexchange D. Private WAN ```
68. C. An intercloud exchange is a service that connects multiple public clouds through a common private WAN connection. This allows a network engineer to configure the private WAN once and be able to transition between the public clouds on the service side without reconfiguration of the private WAN.
69
69. Which statement is not a consideration when converting to an email SaaS application if the majority of users are internal? A. Internal bandwidth usage B. External bandwidth usage C. Location of the users D. Branch office connectivity to the Internet
69. A. Internal bandwidth usage is not a consideration after conversion to a SaaS application. External bandwidth should be considered since internal users will access the application through the Internet. Location of the users should also be a deciding factor in moving to a SaaS model. Branch office connectivity to the Internet should be considered also when converting.
70
70. Which of the following is a virtual network function (VNF) device? A. Virtual switch B. Virtual firewall C. Database server D. File server
70. B. A virtual firewall or virtual router is an example of a VNF. These devices are typically network functions that are found in internal networks such as firewalls and routers. These devices perform basic network functionality and run as a virtual machine or virtual instance.
71
71. You purchase a VM on a public cloud and plan to create a VPN tunnel to the cloud provider. Your IP network is 172.16.0.0/12, and the provider has assigned an IP address in the 10.0.0.0/8 network. What VNF will you need from the provider to communicate with the VM? A. Virtual switch B. Virtual firewall C. Virtual router D. Another IP scheme at the provider
71. C. You will need a virtual router running static NAT to translate the two different IP networks. This type of service is called a virtual network function, or VNF.
72
72. Which protocol would you use to synchronize the VM in the public cloud with an internal time source at your premise? A. DNS B. rsync C. NTP D. VPN
72. C. Network Time Protocol (NTP) is a standardized protocol for network time synchronization
73
73. You need to scale out some web servers to accommodate load. Which method would you use? A. AddvCPUs. B. AddvRAM. C. AddDNS. D. AddSLBaaS.
73. D. If you wanted to scale a web server out to several other web servers, you would use Server Load Balancing as a Server (SLBaaS) from your cloud provider.
74
74. You have several VMs in a public cloud. What is a benefit of creating NTP VNF in the public cloud for the VMs? A. Better time synchronization B. Better response time from the VMs C. Lower bandwidth utilization from your premises D. Overcoming different time zones
74. C. Lowering bandwidth between the premises and your VMs on the public cloud is a direct benefit if locating NTP on the public cloud for VM time synchronization.
75
75. When deciding to move DNS into the cloud for an application on the public cloud, what is the primary decision factor? A. Bandwidth B. Response time C. ProperDNSresolution D. The cloud provider’s requirements
75. A. Bandwidth is the primary decision factor for moving DNS closer to the application in the public cloud. However, if the majority of DNS users are on premises, then it should remain on premises for bandwidth reasons.
76
76. Access layer switches in the three-tier design model perform which task? A. Connect to other switches for redundancy B. Connect to users C. Connect campuses D. Connect to the Internet
76. B. Access layer switches connect to users and are edge network devices.
77
77. Distribution layer switches in the three-tier design model perform which task? A. Connect to other switches for redundancy B. Connect to users C. Connect campuses D. Connect to the Internet
77. A. Distribution layer switches connect to access layer switches and core switches to provide redundancy.
78
78. Core layer switches in the three-tier design model perform which task? A. Connect to other switches for redundancy B. Connect to users C. Connect campuses D. Connect to the Internet
78. C. Core layer switches connect campuses together via the distribution layer switches.
79
79. The two-tier design model contains which layer switches? A. Core,distribution,andaccess B. Core and distribution C. Distribution and access D. Internet,core,distribution,andaccess
79. C. The two-tier, or collapsed-core, model contains only the distribution and access layer switches.
80
80. You have one campus, which contains 2,000 PCs, and each edge switch will contain 25 to 40 PCs. Based on this layout, which design model should be used? A. Collapsed-core model B. Three-tiermodel C. DOD model D. Access model
80. A. Based on the layout of your network, the collapsed-core model is the most appropriate model to design. If at a later time other campuses are joined to the network, the core layer can be added.
81
81. You have four campuses, each containing 500 PCs, and each edge switch will contain 20 to 30 PCs. Based on this layout, which design model should be used? A. Collapsed-core model B. Three-tiermodel C. DOD model D. Access model
81. B. Based on the layout of your network the three-tier model is the most appropriate model to design. Since there are four campuses, the core layer is recommended for connectivity.
82
82. Which should only be performed at the core layer? A. Routing B. Supporting clients C. Configuring ACLs D. Switching
82. D. Only switching between campus (distribution) switches should be performed at the core layer. Nothing should be done to slow down forwarding of traffic, such as using ACLs, supporting clients, or routing between VLANs.
83
83. Which layer in the three-tier model is where redistribution of routing protocols should be performed? A. Core layer B. Distribution layer C. Access layer D. Routing layer
83. B. The distribution layer is where redistribution of routing protocols should be performed. It should never be performed at the core or access layer.
84
84. Which layer in the three-tier model is where collision domains should be created? A. Core layer B. Distribution layer C. Access layer D. Routing layer
84. C. The access layer is where collision domains should be created. This is called network segmentation.
85
85. Which is an accurate statement about the collapsed-core design concept? A. It is best suited for large-scale networks. B. It allows for better bandwidth. C. It is best suited for small enterprises. D. It bottlenecks bandwidth
85. C. The collapsed-core design model is best suited for small enterprises. It can later be expanded out to a three-tier model as an enterprise grows in size. It has no effect on bandwidth if designed right.
86
86. Which network topology design has a centralized switch connecting all of the devices? A. Startopology B. Full mesh topology C. Partial mesh topology D. Hybridtopology
86. A. A star topology has a centralized switch connecting all of the devices outward like a star.
87
87. Which is a direct benefit of a full mesh topology? A. Increasedbandwidth B. Increasedredundancy C. Decreased switch count D. Increasedcomplexity
87. B. Increased redundancy of connections is a direct benefit of a full mesh topology. Although bandwidth will increase because of multiple paths, additional dynamic routing protocols will need to be implemented to achieve this.
88
88. Where is the hybrid topology most commonly seen in the three-tier design model? A. Core layer B. Distribution layer C. Access layer D. Routing layer
88. C. The hybrid topology is most often seen at the access layer. The devices are connected in a star topology and the access layer switches are partially meshed to the distribution layer switches.
89
89. Where is the full mesh topology commonly seen in the three-tier design model? A. Core layer B. Distribution layer C. Access layer D. Routing layer
89. B. Distribution layer switches are fully meshed for redundancy. The number of links can be calculated with the formula of N(N – 1). So if you had four distribution switches, the ports required for a full mesh would be 4(4 – 1) = 4 × 3 = 12 ports among the four switches. The formula of N (N – 1) / 2 would give you the number of links (connected ports): 4(4 – 1) / 2 = 4 × 3 / 2 = 6 links.
90
90. Where is the star topology most commonly seen in the three-tier design model? A. Core layer B. Distribution layer C. Access layer D. Routing layer
90. A. Core layer switches are commonly set up in a star topology. This is because core layer switches connect multiple campuses via distribution layer switches.
91
``` 91. Which topology does the collapsed core layer switch use in a two-tier design model? A. Startopology B. Full mesh topology C. Partial mesh topology D. Hybridtopology ```
91. A. The collapsed core layer switch uses a star topology connecting outward to the access layer switches. This design is often found in small enterprise and single campus design.
92
92. Define a full mesh topology design. A. All links from the central switch connect to the edge switches. B. All links between switches are connected to each other redundantly. C. Only links between similar switch types are connected to each other redundantly. D. All ports are used for connecting only other switches.
92. B. All links between switches are connected redundantly. This allows for both the forwarding plane and control plane to have multiple paths and redundancy. The forwarding plane forwards traffic, and the control plane controls routing between VLANs.
93
93. Define a star topology design. A. All links from the central switch connect to the edge switches. B. All links between switches are connected to each other redundantly. C. Only links between similar switch types are connected to each other redundantly. D. All ports are used for connecting other switches.
93. A. In a star topology, the central switch is connected outward to all edge switches. This is commonly seen at the core layer switch.
94
``` 94. Which topology does an autonomous WAP use? A. Startopology B. Full mesh topology C. Partial mesh topology D. Hybridtopology ```
94. A. An autonomous WAP acts similarly to an access layer switch. However, WAPs normally do not have redundant links back to the distribution switches. So it acts more like a star topology, connecting the Ethernet and wireless clients together.
95
``` 95. If you had limited cable access for the distribution switches, which topology would you need to plan for? A. Startopology B. Full mesh topology C. Partial mesh topology D. Hybridtopology ```
95. C. Generally, office buildings do not have direct runs to each switch closet from the other closets. Although a full mesh is desirable, sometimes only a partial mesh is achievable.
96
96. Which cable standard delivers 1 Gb/s using four pairs of CAT5e? A. 1000Base-T B. 1000Base-SX C. 1000Base-LX D. 1000Base-X
96. A. 1000Base-T is short for 1000 Baseband – Twisted pair. 1000Base-T utilizes all four pairs over standard Cat5e, whereas 100Base-T utilizes only two pairs of Cat5.
97
``` 97. Which fiber optic standard uses a 9 micron core and can span up to 10km? A. UTP B. Multi-mode C. Single-mode D. STP ```
97. C. Single-mode fiber is 9 microns at its core. With proper transceivers, the signal can span 10 km to 70 km without needing to be retransmitted.
98
98. Which cable type would you use to connect a router to a switch? A. Straight-through cable B. Crossovercable C. Rolledcable D. Shieldedcable
98. A. A straight-through cable would be used since routers are DTE, or data terminal equipment, and switches are DCE, or data communications equipment. DTE to DCE requires a straight-through cable.
99
99. What is the maximum distance you can run 1000Base-T? A. 100meters B. 1,000meters C. 100feet D. 1,000feet
99. A. 1000Base-T can be run up to 100 meters, or 328 feet, per its specification.
100
100. What is the terminal specification to connect to a Cisco router or switch via serial cable? A. 9600baud8-N-0 B. 9600baud8-N-1 C. 2400baud8-N-1 D. 115,200baud8-N-1
100. B. You connect to Cisco switches and routers via 900 baud, 8 data bits, no parity, and 1 stop bit.
101
101. Which cable type would you use to connect a switch to a switch? A. Straight-through cable B. Crossovercable C. Rolledcable D. Shieldedcable
101. B. You would use a crossover cable because a switch is a DCE device. When connecting DCE to DCE, you would need to cross the connection with a crossover cable. Newer switches have MDI-X capabilities to detect the need for a crossover cable and will automatically switch the cable over if a straight-through cable is used.
102
102. Which fiber optic standard utilizes a 50 micron core? A. UTP B. Multi-mode C. Single-mode D. STP
102. B. Multi-mode fiber can be either 50 microns or 62.5 microns at its core. The maximum distance for 50 micron fiber is 550 meters utilizing the 1000Base-LX specification.
103
103. Which type of cable would be used to connect a computer to a switch for management of the switch? A. Straight-through cable B. Crossovercable C. Rolledcable D. Shieldedcable
103. C. Although operation of computers connected to a switch uses a straight-through cable, management via the console port requires a rolled cable and an EIA/TIA 232 adapter.
104
104. Which specification for connectivity is currently used in data centers for cost and simplicity? A. 10GBase-T B. 40GBase-T C. 10GBase-CX D. 100GBase-TX
104. C. 10GBase-CX is commonly used in data centers. It is referred to by its nickname of Twinax. It is a fixed, balanced coaxial pair that can be run up to 25 meters.
105
105. If you had an existing installation of Cat5e on your campus, what is the highest speed you could run? A. 10Mb/s B. 100Mb/s C. 1 Gb/s D. 10Gb/s
105. C. Cat5e can support up to 1 Gb/s via the 1000Base-T specification. Since 10Base- T, 100Base-T, and 1000Base-T can be run up to 100 meters in length, it allows for interchangeability with speeds. It was very common when Cat5e came out 16 years ago for installers to future-proof wiring installations with it.
106
106. You get a call that the Internet is down. When you investigate the Internet router and perform a show interface serial 0/0, you see the following status. What might be the problem? Serial0/0 is administratively down, line protocol is up Hardware is MCI Serial A. The serial line connecting to the ISP is down. B. Someone accidentally shut down the serial interface. C. Routing to the ISP is not set correctly. D. The clocking from the ISP has stopped.
106. B. It is most likely, since the interface was working before, that someone “shut down” the interface with the shutdown command. This can be seen in the show interface serial 0/0 command; the interface is reporting it is administratively shut down.
107
107. When performing troubleshooting for a routing issue, which method should be used first to isolate the problem? A. Pinging the destination IP back to the originating IP B. Pinging the originating IP to the destination IP C. Traceroute from the originating IP to the destination IP D. Traceroute from the destination IP to the originating IP
107. C. Traceroute should be used from the originating IP when the problem is to the destination IP. When the traceroute times out is most likely where the problem is located.
108
108. Which command would you run to diagnose a possible line speed or duplex issue? A. Switch#show speed B. Switch#show duplex C. Switch#show interface status D. Switch#show diagnostics
108. C. When you’re checking for speed and/or duplex issues, the show interface status command will detail all of the ports with their negotiated speed and duplex.
109
109. Which command would you use, to diagnose a problem with frames that are not getting forwarded to the destination node on a switch? A. Switch#show route B. Switch#show mac address-table C. Switch#show mac table D. Switch#show interface
109. B. When you’re diagnosing frame forwarding on a switch, the MAC address table needs to be inspected to see if the switch has learned the destination MAC address.
110
110. Which command should you start with when trying to diagnose port security issues? A. Switch#show port-security B. Switch#show mac address-table C. Switch#show interface D. Switch#show security
110. A. When you’re trying to diagnose port security, the first command should be show port-security. This will detail all of the ports with port security and their expected behavior when port security is violated.
111
111. After solving the root cause of a problem, what should be done? A. Isolate the problem. B. Perform root cause analysis. C. Escalate the problem. D. Monitor the solution.
111. D. After isolating the problem, performing root cause analysis, and ultimately solving the problem, the implemented solution should be monitored or verified.
112
112. What is the first step to troubleshooting a problem? A. Isolate the problem. B. Perform root cause analysis. C. Escalate the problem. D. Monitor the solution.
112. A. The first step to troubleshooting a problem is isolating the problem. This can be done various ways and can sometime include documenting the problem to understand the root cause.
113
113. Which command should be used to verify that a VLAN is defined on a switch to troubleshoot a VLAN forwarding issue? A. Switch#show interfaces fast 0/0 switchport B. Switch#show vlan C. Switch#show vlans D. Switch#show vtp
113. B. The first command used to diagnose a VLAN forwarding issue is the show vlan command. This command will show all of the VLANs that are defined on the switch either manually or dynamically through the VLAN Trunking Protocol (VTP).
114
114. It is reported that users cannot reach an internal server. You only have access to the local switches at your facility. You perform a show interface fast 0/23 on the user reporting the problem and the status of the switch is up/up. What should you do next? A. Isolate the problem. B. Perform root cause analysis. C. Escalate the problem. D. Monitor the solution
114. C. Since you only have access to the local switches at your facility and you have checked the local user’s connection status, your only option is to escalate the problem.
115
115. You just installed a new switch and you cannot get traffic forwarded to a remote VLAN. You believe there is a problem with trunking. Which command will you start with to verify trunking. A. Switch#show interfaces fast 0/0 switchport B. Switch#show vlan C. Switch#show vlans D. Switch#show trunks
115. A. The command that you should begin with is show interfaces fast 0/0 switchport. This command will show the trunk status of the port as well as the operational status.
116
``` 116. Which class is the IP address 172.23.23.2? A. Class A B. Class B C. Class C D. Class D ```
116. B. The IP address of 172.23.23.2 is a Class B address.
117
117. Which is the default subnet mask for a Class A address? A. 255.0.0.0 B. 255.255.0.0 C. 255.255.255.0 D. 255.255.255.255
117. A. The default subnet mask of a Class A address is 255.0.0.0.
118
118. Which address is a multicast IP address? A. 221.22.20.2 B. 223.3.40.2 C. 238.20.80.4 D. 240.34.22.12
118. C. The multicast range begins with 224 to 239 in the first octet. Therefore, only the IP address 238.20.80.4 is correct.
119
119. Which is true of an IP address of 135.20.255.255? A. It is a Class A address. B. It is a broadcast address. C. It is the default gateway address. D. It has a default mask of 255.0.0.0
119. B. The IP address 135.20.255.255 is a Class B broadcast address.
120
120. What is the CIDR notation for a subnet mask of 255.255.240.0? A. /19 B. /20 C. /22 D. /28
120. B. The CIDR notation for 255.255.240.0 is /20. The first two subnets are 8 bits (8 × 2 = 16), and the 240 is 4 more bits (16 + 4 = 20).
121
121. You have been given an IP address network of 203.23.23.0. You are asked to subnet it for two hosts per network. What is the subnet mask you will need to use to maximize networks? A. 255.255.255.252 B. 255.255.255.248 C. 255.255.255.240 D. 255.255.255.224
121. A. The mask you will need to use is 255.255.255.252. This will allow for two hosts per network for a total of 64 networks. The formula for solving for hosts is: 2X – 2 is equal to or greater than 2(hosts), which in this case is (22 – 2) = (4 – 2) = 2. So 2 bits are used for the host side, leaving 6 bits for the subnet side. 6 bits + 24 bits (original subnet mask) = /30, or 255.255.255.252.
122
122. You have been given an IP address network of 213.43.53.0. You are asked to subnet it for 22 hosts per network. What is the subnet mask you will need to use to maximize networks? A. 255.255.255.252 B. 255.255.255.248 C. 255.255.255.240 D. 255.255.255.224
122. D. The mask you will need to use is 255.255.255.224. This will allow for 30 hosts per network for a total of eight networks. The formula for solving for hosts is: 2X – 2 is equaltoorgreaterthan22hosts,whichinthiscaseis(25 –2)=(32–2)=30.So5 bits are used for the host side, leaving 3 bits for the subnet side. 3 bits + 24 bits (original subnet mask) = /27, or 255.255.255.224
123
``` 123. Which valid IP is in the same network as 192.168.32.61/26? A. 192.168.32.59 B. 192.168.32.63 C. 192.168.32.64 D. 192.168.32.72 ```
123. A. The valid IP address range for the 192.168.32.0/26 network is 192.168.32.1 to 192.168.32.62, 192.168.32.65 to 192.168.32.126, etc. Therefore, 192.168.32.59 is within the valid IP range of 192.168.32.61/26.
124
124. You are setting up a network in which you need 15 routed networks. You have been given a network address of 153.20.0.0, and you need to maximize the number of hosts in each network. Which subnet mask will you use? A. 255.255.224.0 B. 255.255.240.0 C. 255.255.248.0 D. 255.255.252.0
``` 124. B. The subnet mask will be 255.255.240.0. Since you need to solve for the number of networks, the equation is: 2x is equal to or greater than 15 networks. 24 = 16 completed the equation; the 4 bits represent the subnet side; you add the 4 bits to the 16 bits of the class B subnet mandated by the IETF. 16 + 4 = /20 = 255.255.240.0. ```
125
125. An ISP gives you an IP address of 209.183.160.45/30 to configure your end of the serial connection. Which IP address will be on the side at the ISP? A. 209.183.160.43/30 B. 209.183.160.44/30 C. 209.183.160.46/30 D. 209.183.160.47/30
125. C. The valid IP address range for 209.183.160.45/30 is 209.183.160.45– 209.183.160.46. Both IP addresses are part of the 209.183.160.44/30 network. 209.183.160.47/30 is the broadcast address for the network.
126
126. In the following exhibit, what needs to be changed for Computer A to successfully communicate with Computer B (assume the least amount of effort to fix the problem)? A. Computer A needs to have its IP address changed. B. Computer B needs to have its IP address changed. C. The default gateway IP address for Computer A needs to be changed. D. The default gateway IP address for Computer B needs to be changed.
126. C. Computer A’s default gateway address is 192.168.1.63. This address is the broadcast address for the 192.168.1.0/26 network and cannot be used as that network’s gateway.
127
127. In the following exhibit, what needs to be changed for Computer A to successfully communicate with Computer B (assume the least amount of effort to fix the problem)? A. Computer A needs to have its IP address changed. B. Computer B needs to have its IP address changed. C. The default gateway IP address for Computer A needs to be changed. D. The default gateway IP address for Computer B needs to be changed.
127. A. Computer A needs to have its IP address changed to align with the network that its gateway is in. Computer A is in the 192.168.1.32/27 network, while its gateway address is in the 192.168.1.0/27 network. Although changing the gateway address would work, the least amount of effort needs to be done. Changing the gateway address, which is a valid IP address, would create more work for other clients.
128
128. Which subnet does host 131.50.39.23/21 belong to? A. 131.50.39.0/21 B. 131.50.32.0/21 C. 131.50.16.0/21 D. 131.50.8.0/21
128. B. The /21 subnet mask has subnets in multiples of 8. So the networks would be 131.50.8.0/21, 131.50.16.0/21, 131.50.32.0/21, and 131.50.40.0/21. The IP address of 131.50.39.23/21 would belong to the 131.50.32.0/21 network with a valid range of 131.50.32.1 to 131.50.39.254.
129
129. A computer has an IP address of 145.50.23.1/22. What is the broadcast address for that computer? A. 145.50.254.255 B. 145.50.255.255 C. 145.50.22.255 D. 145.50.23.255
129. D. The network for the computer with an IP address of 145.50.23.1/22 is 145.50.20.0/22. Its valid range is 145.50.20.1 to 145.50.23.254; the broadcast address for the range is 145.50.23.255.
130
130. What is the valid IP address range for the network of 132.59.34.0/23? A. 132.59.34.1 to 132.59.36.254 B. 132.59.34.1 to 132.59.35.254 C. 132.59.34.1 to 132.59.34.254 D. 132.59.34.1 to 132.59.35.255
130. B. The valid IP address range for the network of 132.59.34.0/23 is 132.59.34.1 to 132.59.35.254. The first address of 132.59.34.0/23 is the network ID and the last address of 132.59.35.255 is the broadcast ID.
131
131. What is the subnet mask for a CIDR notation of /20? A. 255.255.224.0 B. 255.255.240.0 C. 255.255.248.0 D. 225.225.252.0
131. B. The /20 CIDR notation written out is 255.255.240.0. The first two 8 bits are 255.255, and the last 4 bits make up the subnet mask of 250 to make a complete mask of 255.255.240.0.
132
132. What is the number of subnets which you can have for a mask of 255.255.255.248? A. 8 B. 16 C. 32 D. 64
132. C. The network mask of 255.255.255.248 borrows 5 bits for the network mask. Using the formula of 2x = subnets, 25 = 32 subnets.
133
133. What is the valid number of hosts for a network with a subnet mask of 255.255.255.224? A. 16 B. 32 C. 14 D. 30
133. D. The valid number of hosts for a network with a subnet mask
134
134. You have been given the network of 141.23.64.0/19. What is a valid host in this network? A. 141.23.120.5/19 B. 141.23.96.12/19 C. 141.23.97.45/19 D. 141.23.90.255/19
134. D. The valid IP range for the network of 141.23.64.0/19 is 141.23.64.1 to 141.23.95.254. The IP address of 141.23.90.255/19 is a valid IP address within this range.
135
135. You have four networks of 141.24.4.0, 141.24.5.0, 141.24.6.0, and 141.24.7.0 that you need to super-net together so you can write one ACL in your firewall. What is the super-netted address you will use? A. 141.24.4.0/20 B. 141.24.4.0/21 C. 141.24.4.0/22 D. 141.24.4.0/23
135. C. Summarization is similar to subnetting, with the exception that you are grouping IP addresses together. Think of it as reverse subnetting. Since /22 is multiples of 4, the statement of 141.24.4.0/22 would give the following range of IP addresses to be blocked: 141.24.4.1 to 141.24.7.254.
136
136. You have eight consecutive networks of 132.22.24.0 to 123.22.31.0, which you need to super-net together so you can write one ACL in your firewall. What is the super-netted address you will use? A. 132.22.24.0/20 B. 132.22.24.0/21 C. 132.22.24.0/22 D. 132.22.24.0/23
136. B. Summarization is similar to subnetting, with the exception that you are grouping IP addresses together. Think of it as reverse subnetting. Since /21 is multiples of 8, the statement of 132.22.24.0/21 would give the following range of IP addresses to be blocked: 132.22.24.1 to 132.22.31.254.
137
137. You need to use the IP address space of 198.33.20.0/24 and create a VLSM subnet scheme for the network in the following exhibit. What is the network ID for Subnet A? A. 198.33.20.0/25 B. 198.33.20.0/24 C. 198.33.20.0/26 D. 198.33.20.0/28
137. A. Using the subnet of 198.33.20.0/25 will give you 126 nodes. Since you are using 1 bit of the 8 bits in the 4th octet for the network ID, you have 7 bits left for the hosts. Usingtheformulaof2x –2=validhosts,27 –2=128–2=126validhosts.
138
138. You need to use the IP space of 198.33.20.0/24 and create a VLSM subnet scheme for the network in the following exhibit. What is the network ID for Subnet B? A. 198.33.20.0/25 B. 198.33.20.0/24 C. 198.33.20.0/26 D. 198.33.20.0/28
138. C. Using the subnet of 198.33.20.0/26 will give you 62 nodes. Since you are using 2 bits of the 8 bits in the 4th octet for the network ID, you have 6 bits left for the hosts. Usingtheformulaof2x –2=validhosts,26–2=64–2=62validhosts.
139
139. You need to use the IP space of 198.33.20.0/24 and create a VLSM subnet scheme for the network in the following exhibit. What is the network ID for Subnet C? A. 198.33.20.0/25 B. 198.33.20.0/24 C. 198.33.20.0/26 D. 198.33.20.0/28
139. D. Using the subnet of 198.33.20.0/28 will give you 16 nodes. Since you are using 4 bits of the 8 bits in the 4th octet for the network ID, you have 4 bits left for the hosts. Usingtheformulaof2x –2=validhosts,24 –2=16–2=14validhosts.
140
140. A computer with an IP address of 172.18.40.5/12 is having trouble getting to an internal server at an IP address of 172.31.2.4. The default gateway of the computer is 172.16.1.1. What is the problem? A. The IP address of the computer is wrong. B. The IP address of the default gateway is wrong. C. The IP address of the internal server is wrong. D. The problem is not the networking configuration.
140. D. The computer had an IP address of 172.18.40.5/12 and it belongs to the 172.16.0.0/12 network, which has a range of 172.16.0.1 to 172.31.255.254. Therefore, the internal server is within the same network as the computer, and the default gateway has no effect on the problem. The conclusion is that the network is not the problem.
141
141. A computer has an IP address of 192.168.1.6/24, and its gateway address is 192.168.1.1. It is trying to reach a server on an IP address of 127.20.34.4. The server is not responding. What is the problem? A. The IP address of the computer is wrong. B. The IP address of the default gateway is wrong. C. The IP address of the internal server is wrong. D. The problem is not the networking configuration.
141. C. The computer and the gateway address are correct; the IP address of the remote server is wrong. It is a loopback address and can only be internally used by the local computer. The valid range for loopback is 127.0.0.1 to 127.255.255.254.
142
142. Which is true about a layer 3 broadcast? A. All of the network bits are ones. B. The destination MAC in the frame is always all Fs. C. The broadcast can be segmented by switches. D. The IP address is always 255.255.255.255.
142. B. A layer 3 broadcast is always all ones in the host portion of the IP address. When the IP stack see this, it puts all Fs in the destination Ethernet MAC address.
143
143. Which method is used to direct communications to a single host? A. Unicast B. Broadcast C. Multicast D. Anycast
143. A. A unicast address is a single valid IP address for direct communications purposes between two hosts.
144
144. Which method is used to direct communications to the closest IP address to the source? A. Unicast B. Broadcast C. Multicast D. Anycast
144. D. Anycast is a way of allowing the same IP address on multiple machines in different geographical areas. The routing protocol is used to advertise in routing tables the closest IP by the use of metrics. Currently this is how DNS root servers work.
145
145. Which method is used to direct communications to a group of computers that subscribe to the transmission? A. Unicast B. Broadcast C. Multicast D. Anycast
145. C. Multicast is used to allow computers to opt into a transmission. Examples of uses for multicast are imaging of computers, video, and routing protocols, to name a few.
146
146. What is the multicast address range? | A. 224.0.0.0/7 B. 224.0.0.0/6 C. 224.0.0.0/5 D. 224.0.0.0/4
146. D. The multicast address range is 224.0.0.0 to 239.255.255.255. The /4 depicts a subnet of 16.
147
147. Which protocol allows multicast switches to join computers to the multicast group? A. ICMP B. IGMP C. IPMI D. IPGRP
147. B. IGMP, or Internet Group Messaging Protocol, allows switches to join computers to the multicast group table. This allows the selective process of snooping to occur when a transmission is sent.
148
148. Which protocol uses broadcasting at layer 3? A. ARP B. DHCP C. IGMP D. SNMP
148. B. DHCP uses a packet called a Discover packet. This packet is addressed to 255.255.255.255. Although ARP uses a broadcast, it is a layer 2 broadcast, not a layer 3 broadcast.
149
149. Which method is used to direct communications to all computers in a subnet? A. Unicast B. Broadcast C. Multicast D. Anycast
149. B. A broadcast will forward a message to all computers in the same subnet.
150
150. Which of the following is an example of a multicast address? A. 192.168.1.224 B. 240.23.4.224 C. 239.45.32.1 D. 244.23.43.11
150. C. The multicast address range is 224.0.0.0 to 239.255.255.255.
151
151. Which RFC defines private IP addresses? A. RFC 1819 B. RFC 1911 C. RFC 1918 D. RFC 3030
151. C. RFC 1918 defines three private address ranges, which are not routable on the Internet.
152
152. What is a major reason to use private IP addressing? A. It allows for the conservation of public IP addresses. B. Since they are non-routable on the Internet, they are secure. C. It keeps communications private. D. They allow easier setup than public IP addresses.
152. A. The private IP address space was created to preserve the number of public IP addresses.
153
153. What is required when using private IP addresses to communicate with Internet hosts? A. Internet router B. IPv4tunnel C. VPNtunnel D. Network Address Translation
153. D. Network Address Translation (NAT) is required to communicate over the Internet with private IP addresses.
154
``` 154. Which is the Class A private IP address range? A. 10.0.0.0/8 B. 10.0.0.0/12 C. 172.16.0.0/12 D. 10.0.0.0/10 ```
154. A. The Class A private IP address range is defined as 10.0.0.0/8. The address range is 10.0.0.0 to 10.255.255.255.
155
155. Which is the Class B private IP address range? A. 10.0.0.0/8 B. 10.0.0.0/12 C. 172.16.0.0/12 D. 10.0.0.0/10
155. C. The Class B private IP address range is defined as 172.16.0.0/12. The address range is 172.16.0.0 to 172.31.255.255.
156
156. Which is the Class C private IP address range? A. 192.168.1.0/24 B. 192.168.0.0/24 C. 192.168.0.0/16 D. 192.168.0.0/12
156. C. Although a Class C address has a classful subnet mask of 255.255.255.0, the private IP address range put aside for Class C addresses is 192.168.0.0 to 192.168.255.255, written in CIDR notation as 192.168.0.0/16.
157
157. You plug a laptop into a network jack. When you examine the IP address, you see 169.254.23.43. What can you conclude? A. The network jack is not working. B. Your laptop has a static IP address configured. C. The network is configured properly. D. The DHCP server is down.
157. D. Any address in the range of 169.254.0.0/16 is a link-local address. It means that the computer has sensed that a network connection is present, but no DHCP is present. The network only allows local communications and no routing. Microsoft refers to this as an APIPA address.
158
158. You plug a laptop into a network jack. When you examine the IP address, you see 10.23.2.3. What can you conclude? A. The network jack is not working. B. Your laptop has a static IP address configured. C. The network is configured properly. D. The DHCP server is down.
158. C. The network seems to be configured properly. You have received a valid address in the Class A space of the RFC 1918 private address range.
159
159. You want to put a web server online for public use. Which IP address would you use? A. 192.168.34.34 B. 172.31.54.3 C. 10.55.33.32 D. 198.168.55.45
159. D. 198.168.55.45 is a valid IPv4 public address. All of the other addresses are RFC 1918 compliant and thus non-routable on the Internet.
160
160. Who is the governing body that distributes public IP address? A. IANA B. RFC C. IAB D. IETF
160. A. IANA, or the Internet Assigned Numbers Authority, is the governing body, which distributes public IP addresses and registers them to ISPs.
161
161. Why is IPv6 needed in the world today? A. It does not require NAT to operate. B. The IPv4 address space is exhausted. C. IPv4 is considered legacy, and IPv6 is the replacement. D. IPv6 does not require subnetting.
161. B. IPv4 allows for 232 = 4.3 billion addresses. However, only 3.7 billion are usable, because of reservations and classful addressing. The current IPv4 address space is 128 38 exhausted and IPv6 allows for 2 = 3.4 × 10 .
162
162. How many bits is an IPv6 address? A. 32 bits B. 64bits C. 128 bits D. 256bits
162. C. An IPv6 address is 128 bits: 64 bits is the network ID, and 64 bits is the host ID.
163
163. You have two facilities and both use IPv6 addressing internally. However, both facilities are connected to the Internet via IPv4. What is one recommended method you can use to communicate between the facilities over the Internet? A. Dedicatedleasedline B. Frame Relay C. Dual stack D. 6to4tunnel
163. D. A 6to4 tunnel can be achieved between the routers. This encapsulates the IPv6 header in an IPv4 header so that it can be routed across the Internet.
164
164. Which command is required on a router to support IPv6 static addressing? A. Router(config)#ipv6 address B. Router(config)#ipv6 routing C. Router(config)#ipv6 enable D. Router(config)#ipv6 unicast-routing
164. D. In order to enable IPv6 on a router, you must globally configure the router with the command ipv6 unicast-routing. Although ipv6 enable will work, it will allow only link-local addressing.
165
165. Which command would you use on an interface to set the IPv6 address? A. Router(config-if)#ip address 2001:0db8:85aa:0000:0000:8a2e:1343:1337 B. Router(config-if)#ipv6 address 2001:0db8:85aa:0000:0000:8a2e:1343:1337 C. Router(config-if)#ip address 2001:0db8:85aa:0000:0000:8a2e:1343:1337/64 D. Router(config-if)#ipv6 address 2001:0db8:85aa:0000:0000:8a2e:1343:1337/64
165. D. When you configure routers, always use the rule of major/minor. The major protocol is ipv6, and the minor command is address. So the correct command is ipv6 address 2001:0db8:85aa:0000:0000:8a2e:1343:1337/64. The additional rule is to specify the network portion with a /64.
166
166. Which field of the IPv6 header allows for a dual-stack host to decide which stack to process the packet in? A. Version field B. Flow label C. Source address D. Destination address
166. A. The first 4 bits of an IPv6 header contain the version number. In an IPv4 packet, this is set to 0100, but in an IPv6 packet, this number is set to 0110. This allows for the host to decide which stack to process the packet in.
167
167. Which command would set the IPv6 default route for a router to interface s0/0? A. Router(config)#ip route 0.0.0.0/0 s0/0 B. Router(config)#ipv6 route 0.0.0.0/0 s0/0 C. Router(config)#ipv6 unicast-route ::0/0 s0/0 D. Router(config)#ipv6 route ::0/0 s0/0
167. D. When you configure routers, always use the rule of major/minor. The major protocol is ipv6 and the minor command is route. So the correct command is ipv6 route ::0/0 s0/0, specifying the ::0/0 s0/0 to mean everything out of the existing interface of s0/0.
168
168. You want to see all of the interfaces on a router configured with IPv6. Which command would you use? A. Router#show ipv6 interfaces brief B. Router#show ip interfaces brief C. Router#show interfaces status D. Router#show ip addresses
168. A. When you use a show command, always follow it with the major protocol and then the parameters. The show ipv6 interfaces brief command would show all of the interfaces configured with an IPv6 address.
169
169. Which dynamic routing protocol(s) can be used with IPv6? A. RIPng B. OSPFv3 C. EIGRPv6 D. All of the above
169. D. RIPng, OSPFv3, and EIGRPv6 are all dynamic routing protocols that work with IPv6.
170
170. You need to see all routes in the routing table for only IPv6. Which command will achieve this? A. Router#show route B. Router#show ip route C. Router#show ipv6 route D. Router#show route ipv6
170. C. The command show ipv6 route will display only the IPv6 routes in the routing table.
171
171. Which is a valid shortened IPv6 address for 2001: 0db8:0000:0000:0000:8a2e:0000:1337? A. 2001:db8:0000::8a2e::1337 B. 2001:db8:::8a2e:0000:1337 C. 2001:db8::8a2e::1337 D. 2001:db8::8a2e:0:1337
171. D. You can remove leading 0s in the quartet, and you can condense four zeros to one zero. However, you can use the :: to remove zeros only once.
172
172. Which is the correct expanded IPv6 address of 2001::456:0:ada4? A. 2001:0000:0000:0456:0000:ada4 B. 2001:0000:0000:0000:456:0000:ada4 C. 2001:0000:0000:0000:0000:0456:0000:ada4 D. 2001:0000:0000:0000:0456:0000:0000:ada4
172. C. Expanding out the IP of 2001::0456:0:ada4, you first expand the :0: to four zeros. Then expand the remainder of the quartets to 0s to make a 32-digit number again.
173
173. In the IPv6 address of 2001.0db8:1234:0016:0023:8080:2345:88ab/64, what is the subnet quartet? A. 1234 B. 0016 C. 0023 D. 8080
173. B. The first 48 bits of an IPv6 address is the global prefix; the next 16 bits is the subnet portion of the IPv6 address. 48 bits + 16 bits = 64 bits for the network ID.
174
174. What is the network prefix for the IPv6 address of 2001.db8::8080:2345:88ab/64? A. 2001:db8::/64 B. 2001:0db8:8080:2345/64 C. 2001:0db8:0000:8080/64 D. 2001:0db8:0000:2345/64
174. A. The network prefix is 2001:db8::/64. Expanded it is written as 2001:0db8:0000:0000/64. However, the condensed version written in the answer is valid
175
175. You need to verify connectivity to an IPv6 address of fc00:0000:0000:0000:0000:0000: 0000:0004. Which command would you use? A. Router#ping fc00::4 B. Router#ping fc::4 C. Router#ping6 fc00::4 D. Router#ping6 fc::4
175. C. The command to ping an IPv6 address is ping6. The valid condensed address for fc00:0000:0000:0000:0000:0000:0000:0004 is fc00::4. You cannot condense trailing zeros such as fc00. You can only condense leading zeros
176
176. Which address is a valid IPv6 host address? A. fe8::1 B. 2001:db8::2435 C. ff02::1 D. ::1
176. B. The address 2001:db8::2435 is a valid IP address. It is shortened by removing leading zeros and condensed. You cannot clip off the trailing zeros in an address like fe80::1. Also, ff02::1 is a multicast address and cannot be used for host addressing.
177
177. Which statement is true of an IPv6 address? A. The first 48 bits is the subnet ID. B. All IPv6 addresses have a built-in loopback. C. A single interface can be assigned multiple IPv6 addresses. D. The IPv6 address plan allows for doubling the amount of IPv4 addresses.
177. C. A single interface can be configured with multiple addresses. Most host interfaces will have a link-local address for duplicate address detection.
178
178. You have been given an IPv6 prefix of 2001:0db8:aabb:5/52. How many subnets can you have from this address? A. 8,192 B. 4,096 C. 1,024 D. 512
178. B. The answer is 4,096 subnets. You have been given the first 52 bits from your ISP. However, the complete network ID is 64 bits. You subtract 52 bits from 64 bits = 12 bits, then 212 = 4,096.
179
179. You work for an ISP. The American Registry for Internet Numbers (ARIN) has given you the 2001:0db8:8/34 IP address block. You need to figure out how many /48 blocks you can assign to your customers. A. 32,768 B. 16,384 C. 8,192 D. 4,096
179. B. The answer is 16,384 networks. You subtract 34 bits from 48 bits = 14 bits, then 214 = 16384
180
180. How many bits are contained in each field of an IPv6 address between the colons? A. 8 bits B. 32 bits C. 4bits D. 16bits
180. D. In between each set of colons or field there are four hex numbers, and each hex number represents 4 bits. Four numbers × 4 bits = 16 bits. In an IPv6 address, there are eight fields of 16 bits. Eight fields x 16 bits = 128 bit address.
181
181. Which command would be used inside of an interface to configure SLAAC? A. Router(config-if)#enable slaac B. Router(config-if)#ipv6 address slaac C. Router(config-if)#ipv6 address dhcp D. Router(config-if)#ipv6 address autoconfig
181. D. The correct command to configure Stateless Address Autoconfiguration is ipv6 address autoconfig. Although ipv6 address dhcp is a valid command, it requires a stateful DHCP server.
182
182. Which address is used for RS (Router Solicitation) messages? A. ff00::2 B. ff02::2 C. ff00::1 D. ff02::1
182. B. Router solicitations are sent on a multicast address of ff02:2. This address is a local scope multicast to all IPv6 routers.
183
183. Which address is used for RA (Router Advertisement) messages? A. ff00:2 B. ff02:2 C. ff00:1 D. ff02:1
183. D. Router advertisements are sent on a multicast address of ff02:1. This address is a local scope multicast to all IPv6 hosts.
184
184. What protocol/process in IPv6 replaces the IPv4 ARP process? A. NDP(NS/NA) B. DAD (NS/NA) C. SLAAC (RS/RA) D. ARPv6(NS/NA)
184. A. The Neighbor Discovery Protocol uses Neighbor Solicitation and Neighbor Advertisements messages to look up an IP address from a MAC address through the use of multicast.
185
185. Which layer 3 protocol allows for NDP to process SLAAC? A. IGMP B. ICMP C. ICMPv6 D. IGMPv6
185. C. The layer 3 protocol that Neighbor Discovery Protocol uses to process Stateless Address Autoconfiguration are ICMPv6 messages.
186
186. What are stateless DHCPv6 servers used for? A. Configuring the default gateway B. Configuring the IPv6 address C. Configuring the IPv6 prefix length D. Configuring the DNS server address
186. D. Stateless DHCPv6 servers are used to configure DHCP options only. The one option that all clients need is the DNS server.
187
187. Which command will configure an IPv6 DHCP relay agent for an interface? A. Router(config-if)#ipv6 helper 2001:db8:1234::1 B. Router(config-if)#ipv6 dhcp helper 2001:db8:1234::1 C. Router(config-if)#ipv6 dhcp 2001:db8:1234::1 D. Router(config-if)#ipv6 dhcp relay destination 2001:db8:1234::1
187. D. You can set the IPv6 DHCP relay agent on the interface for a stateful DHCPv6 server using the command ipv6 dhcp relay destination 2001:db8:1234::1.
188
188. Which mechanism in IPv6 allows for SLAAC to avoid duplicating an IPv6 address? A. NDP(NS/NA) B. DAD (NS/NA) C. SLAAC (RS/RA) D. ARPv6(NS/NA)
188. B. Duplicate Address Detection, or DAD, uses Neighbor Solicitation and Neighbor Advertisement messages to avoid duplicate addresses when SLAAC is being used.
189
189. What is the process of stateful DHCPv6 for IPv6? A. Discover,Offer,Request,Acknowledge B. Solicit,Advertise,Request,Reply C. NeighborSolicitation,NeighborAdvertisement D. RouterSolicitation,RouterAdvertisement
189. B. Stateful DHCPv6 uses a process similar to DORA for IPv4. However, IPv6 uses multicast in lieu of broadcasts via the DHCPv6 Solicit multicast address.
190
190. When SLAAC is performed on an IPv6 host, which process happens first? A. A Router Solicitation message is sent from the client. B. A Router Advertisement message is sent from the router. C. A link-local address is auto-configured on the client. D. DAD is performed on the IPv6 address.
190. C. Before a host can communicate via an RS packet, it first needs a valid IP address. The first address is a link-local address so that it can send an RS packet and receive an RA packet. The client performs DAD on both the link-local address and the proposed address.
191
191. Which address is a global unicast address? A. fe80:db80:db01:ada0:1112::1 B. 2005:acd:234:1132::43 C. fd00:ac34:34b:8064:234a::7 D. ff00:101:4ab0:3b3e::10
191. B. The global unicast address is defined as 2000::/3. This provides a valid range of 2000:: to 3fff::
192
192. Which address is a link-local address? A. fe80:db80:db01:ada0:1112::1 B. 2005:acd:234:1132::43 C. fd00:ac34:34b:8064:234a::7 D. ff00:101:4ab0:3b3e::10
192. A. The link-local address is defined as fe80::/10. Any address starting with fe80 is non-routable.
193
193. For global unicast addresses, which part of the address is allotted by the RIR, or Regional Internet Registry? A. First 23 bits B. First 32 bits C. First 48 bits D. First 64 bits
193. A. The first 23 bits are allotted to the ISP by the RIR for the region of the world for which the ISP is requesting the prefix
194
194. Which address is a unique-local address? A. fe80:db80:db01:ada0:1112::1 B. 2005:acd:234:1132::43 C. fd00:ac34:34b:8064:234a::7 D. ff00::10
194. C. The unique-local address is defined as fc00::/7. Unique-local addresses have replaced site-local addresses as of 2004 and are non-routable. The valid IPv6 range is fc00:: to fd00:: despite IANA reserving fc00::/7 as the fc00:: range. The range should not be used since the 8th bit is considered the “local bit” and is required to be a 1, as in, for example, 1111 1101 = fd.
195
195. Which address is a multicast address? A. fe80:db80:db01:ada0:1112::1 B. 2005:acd:234:1132::43 C. fd00:ac34:34b:8064:234a::7 D. ff00::10
195. D. The multicast address is defined as ff00::/8. Multicast addresses always start with ff.
196
196. Which IPv6 address type is similar to IPv4 RFC 1918 addresses? A. Link-local addresses B. Global unicast addresses C. EUI-64addresses D. Anycast addresses
196. A. IPv4 RFC 1918 addresses are defined as private non-routable IP addresses. In IPv6, link-local addresses are the equivalent to RFC 1918 addresses and are non- routable.
197
197. Which command would configure a single anycast address on a router’s interface? A. Router(config-if)#ip address 2001:db8:1:1:1::12/64 B. Router(config-if)#ipv6 address 2001:db8:1:1:1::12/64 anycast C. Router(config-if)#ipv6 anycast address 2001:db8:1:1:1::12/128 D. Router(config-if)#ipv6 address 2001:db8:1:1:1::12/128 anycast
197. D. The command to configure an anycast address on an interface would be ipv6 address 2001:db8:1:1:1::12/128 anycast. The /128 defines a single IP to advertise in routing tables.
198
198. You are using the EUI-64 method of allocating the host portion of the IPv6 addresses. The MAC address of the host is f423:5634:5623. Which is the correct IP address that will be calculated for a network ID of fd00:1:1::? A. fd00:0001:0001:0000:f623:56ff:fe34:5623/64 B. fd00:0001:0001:0000:f423:56ff:fe34:5623/64 C. fd00:0001:0001:0000:fffe:f623:5634:5623/64 D. fd00:0001:0001:0000:f623:56ff:ff34:5623/64
198. A. When converting a MAC address to an EUI-64 host address, the first step is to split the MAC address into 6-byte sections of f42356 and 345623 and place fffe in between them, f423:56ff:fe34:5623. This gives you a 64-bit value comprised of a 48-bit MAC address and a 16-bit filler. You must then invert “flip” the 7th bit. Example: f4 = 1111 010 = flipped = 1111 0110 = f6.
199
199. Which address is a EUI-64 generated address? A. 2001:db8:33::f629:58fe:ff35:5893/64 B. fd00:4:33::f680:45ca:ac3b:5a73/64 C. 2001:db8:aa::f654:56ff:fe34:a633/64 D. 2001:db8:17:fffe:f623::ff34:5623/64
199. C. The EUI-64 address can always be found by looking at the last 64 bits. In between the last 64 bits of the address, you will always find fffe.
200
200. Which command would use the MAC address for the host portion of the IPv6 address on a router interface? A. Router(config-if)#ip address eui-64 2001:db8:1234::/64 B. Router(config-if)#ip address 2001:db8:1234::/64 mac-address C. Router(config-if)#ipv6 address 2001:db8:1234::/64 eui-64 D. Router(config-if)#ipv6 address 2001:db8:1234::/64 mac
200. C. The command to set an EUI-64 address for the host portion of the IPv6 address on an interface is ipv6 address 2001:db8:1234::/64 eui-64.
201
201. You are using the EUI-64 method of allocating the host portion of the IPv6 addresses. The MAC address of the host is e5ee:f556:2434. What is the correct IP address that will be calculated for a network ID of fd00:2:2::? A. fd00:2:2::e9ee:f5ff:fe56:2434/64 B. fd00:2:2::fffe:e5ee:f556:2434/64 C. fd00:2:2::e7ee:f5ff:fe56:2434/64 D. fd00:2:2::e2ee:f5ff:fe56:2434/64
201. C. When converting a MAC address to an EUI-64 host address, the first step is to split the MAC address into 6-byte sections of e5eef5 and 562434 and place fffe in between them: e5ee:f5ff:fe56:2434. This gives you a 64-bit value comprised of a 48-bit MAC address and a 16-bit filler. You must then invert “flip” the 7th bit. Example: e5 = 1110 011 = flipped = 1110 0111 = e7.
202
202. Which command would you use to find the joined multicast groups for an IPv6 interface? A. Router#show ipv6 multicast B. Router#show ipv6 interface gi 0/1 C. Router#show ipv6 routes D. Router#show mutlicast
202. B. The output of show ipv6 interface gi 0/1 shows the multicast groups the
203
203. Which type of IPv6 addressing allows for a one-to-many address for IP services? A. Multicast address B. Anycast address C. Unicast address D. Localcast address
203. A. A one-to-many IPv6 address is a multicast address. One multicast address will allow many IPv6 clients to receive the transmission.
204
204. What type of address is ::1/128? A. Multicast address B. Anycast address C. Unicast address D. Loopback address
204. D. The ::1 address is a special address called a loopback address, similar to 127.0.0.1 in IPv4.
205
205. Which type of IPv6 addressing allows for a one-to-closest address for IP services? A. Multicast address B. Anycast address C. Unicast address D. Loopback address
205. B. A one-to-closest IPv6 address is an anycast address. Many routers or services can have the same address. However, routing protocols allow for the client to be directed to the closest resource.
206
``` 206. Which type of automatic address assignment will not allow for EUI-64 addressing? A. Static addressing B. SLAAC addressing C. Stateful DHCPv6 addressing D. Stateless DHCPv6 addressing ```
206. C. Stateful DHCPv6 addressing will not allow EUI-64 addressing. This is because the DHCPv6 server is responsible for allocating an IPv6 address from a predefined pool.
207
207. Which type of address always uses the EUI-64 addressing mechanism? A. Link-local addresses B. Global unicast addresses C. SLAAC addresses D. Anycast addresses
207. A. Link-local addresses starting with fe80::/10 always configure the host portion of the address with an EUI-64 address. Note that Microsoft products default to a random host ID and can be configured to generate the host ID with EUI-64.
208
208. You have been given an IPv6 address of 2030:3454:aabb::/64. What can you conclude? A. The IP address is a unique-local address. B. The IP has been given to you by the Regional Internet Registry. C. The IP has been given to you by the Internet service provider. D. The IP has been given to you by IANA.
208. C. The IPv6 address has been given to you by the ISP with your company’s unique identifier. The first 32 bits are allocated to the ISPs, and they in turn add a unique 16-bit address for your company. This makes 32 bits + 16 bits = 48 bits. You have 16 bits for subnetting after the first 48 bits to make a full 64-bit network ID.
209
209. You are using the EUI-64 method of allocating the host portion of the IPv6 addresses. The MAC address of the host is 401e:32e4:ff03. What is the correct IP address that will be calculated for a network ID of fd00:3:3::? A. fd00:3:3::fffe:421e:32e4:ff03/64 B. fd00:3:3::421e:32ff:fee4:ff03/64 C. fd00:3:3::401e:32ff:fee4:ff03/64 D. fd00:3:3::421e:32ff:ffe4:ff03/64
209. B. When converting a MAC address to an EUI-64 host address, the first step is to split the MAC address into 6-byte sections of 401e32 and e4ff03 and place fffe in between them: 401e:32ff:fee4:ff03. This gives you a 64-bit value comprised of a 48 bit MAC address and a 16 bit filler. You must then invert “flip” the 7th bit. Example: 40 = 0100 000 = flipped = 0100 0010 = 42.
210
``` 210. Which is a valid unique-local address? A. fec0:1111:2e3c:eab3::5/64 B. fe80:d2e1:e24:63::25/64 C. fd00:1edc:bae:eea4::2478/64 D. fc00:4fec:ecf2:343::e44/64 ```
210. C. Although the unique-local address scope is defined as fc00::/7, RFC 4193 states that the 8th bit must equal a one for the local (L) bit. This requires the address to always start with fd which in binary is 1111 = f and 1101 = d or 1111 1101 = fd.

CCNA Practice TESTS (6 decks)

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