Final Exam Flashcards
Which two traffic types use the Real-Time Transport Protocol (RTP)? (Choose two.)
video
web
file transfer
voice
peer to peer
video
voice
Which wireless technology has low-power and data rate requirements making it popular in home automation applications?
ZigBee
LoRaWAN
5G
Wi-Fi
ZigBee
Explanation: ZigBee is an IEEE 802.15.4 wireless standard designed for creating personal-area networks. Low energy, power, and data rate requirements make Zigbee a popular protocol for connecting home automation devices.
Which layer of the TCP/IP model provides a route to forward messages through an internetwork?
application
network access
internet
transport
internet
Explain:
The OSI model network layer corresponds directly to the internet layer of the TCP/IP model and is used to describe protocols that address and route messages through an internetwork.
Which type of server relies on record types such as A, NS, AAAA, and MX in order to provide services?
DNS
email
file
web
DNS
Explain:
A DNS server stores records that are used to resolve IP addresses to host names. Some DNS record types include the following:
A – an end device IPv4 address
NS – an authoritative name server
AAAA – an end device IPv6 address
MX – a mail exchange record
What are proprietary protocols?
protocols developed by private organizations to operate on any vendor hardware
protocols that can be freely used by any organization or vendor
protocols developed by organizations who have control over their definition and operation
a collection of protocols known as the TCP/IP protocol suite
protocols developed by organizations who have control over their definition and operation
Explain:
Proprietary protocols have their definition and operation controlled by one company or vendor. Some of them can be used by different organizations with permission from the owner. The TCP/IP protocol suite is an open standard, not a proprietary protocol.
What service is provided by DNS?
Resolves domain names, such as cisco.com, into IP addresses.
A basic set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the web.
Allows for data transfers between a client and a file server.
Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.
Resolves domain names, such as cisco.com, into IP addresses.
A client packet is received by a server. The packet has a destination port number of 110. What service is the client requesting?
DNS
DHCP
SMTP
POP3
POP3
What command can be used on a Windows PC to see the IP configuration of that computer?
show ip interface brief
ping
show interfaces
ipconfig
ipconfig
A wired laser printer is attached to a home computer. That printer has been shared so that other computers on the home network can also use the printer. What networking model is in use?
client-based
master-slave
point-to-point
peer-to-peer (P2P)
peer-to-peer (P2P)
Explanation: Peer-to-peer (P2P) networks have two or more network devices that can share resources such as printers or files without having a dedicated server.
What characteristic describes a virus?
a network device that filters access and traffic coming into a network
the use of stolen credentials to access private data
an attack that slows or crashes a device or network service
malicious software or code running on an end device
malicious software or code running on an end device
Three bank employees are using the corporate network. The first employee uses a web browser to view a company web page in order to read some announcements. The second employee accesses the corporate database to perform some financial transactions. The third employee participates in an important live audio conference with other corporate managers in branch offices. If QoS is implemented on this network, what will be the priorities from highest to lowest of the different data types?
financial transactions, web page, audio conference
audio conference, financial transactions, web page
financial transactions, audio conference, web page
audio conference, web page, financial transactions
audio conference, financial transactions, web page
Explanation: QoS mechanisms enable the establishment of queue management strategies that enforce priorities for different categories of application data. Thus, this queuing enables voice data to have priority over transaction data, which has priority over web data.
Match the description to the IPv6 addressing component. (Not all options are used.)
VER IMAGEM
Place the options in the following order:
This network portion of the address is assigned by the provider. global routing
This part of the address is used by an organization to identify subnets. subnet ID
This part of the address is the equivalent to the host portion of an IPv4 address. interface ID
Refer to the exhibit. If Host1 were to transfer a file to the server, what layers of the TCP/IP model would be used?
only application and Internet layers
only Internet and network access layers
only application, Internet, and network access layers
application, transport, Internet, and network access layers
only application, transport, network, data link, and physical layers
application, session, transport, network, data link, and physical layers
VER IMAGEM
application, transport, Internet, and network access layers
Explanation: The TCP/IP model contains the application, transport, internet, and network access layers. A file transfer uses the FTP application layer protocol. The data would move from the application layer through all of the layers of the model and across the network to the file server.
Match the characteristic to the forwarding method. (Not all options are used.)
VER IMAGEM
Explanation: A store-and-forward switch always stores the entire frame before forwarding, and checks its CRC and frame length. A cut-through switch can forward frames before receiving the destination address field, thus presenting less latency than a store-and-forward switch. Because the frame can begin to be forwarded before it is completely received, the switch may transmit a corrupt or runt frame. All forwarding methods require a Layer 2 switch to forward broadcast frames.
Refer to the exhibit. The IP address of which device interface should be used as the default gateway setting of host H1?
R1: S0/0/0
R2: S0/0/1
R1: G0/0
R2: S0/0/0
VER IMAGEM
Explanation: The default gateway for host H1 is the router interface that is attached to the LAN that H1 is a member of. In this case, that is the G0/0 interface of R1. H1 should be configured with the IP address of that interface in its addressing settings. R1 will provide routing services to packets from H1 that need to be forwarded to remote networks.
What service is provided by Internet Messenger?
An application that allows real-time chatting among remote users.
Allows remote access to network devices and servers.
Resolves domain names, such as cisco.com, into IP addresses.
Uses encryption to provide secure remote access to network devices and servers.
An application that allows real-time chatting among remote users.
Refer to the exhibit. Match the network with the correct IP address and prefix that will satisfy the usable host addressing requirements for each network.
VER IMAGEM
Explanation: Network A needs to use 192.168.0.128 /25, which yields 128 host addresses.
Network B needs to use 192.168.0.0 /26, which yields 64 host addresses.
Network C needs to use 192.168.0.96 /27, which yields 32 host addresses.
Network D needs to use 192.168.0.80/30, which yields 4 host addresses.
Refer to the exhibit. Which protocol was responsible for building the table that is shown?
DHCP
ARP
DNS
ICMP
VER IMAGEM
R: ARP
Explanation: The table that is shown corresponds to the output of the arp -a command, a command that is used on a Windows PC to display the ARP table.
A network administrator notices that some newly installed Ethernet cabling is carrying corrupt and distorted data signals. The new cabling was installed in the ceiling close to fluorescent lights and electrical equipment. Which two factors may interfere with the copper cabling and result in signal distortion and data corruption? (Choose two.)
crosstalk
extended length of cabling
RFI
EMI
signal attenuation
RFI
EMI
A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in its ARP cache. How will the device obtain a destination MAC address?
(A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in the ARP cache. How will the device obtain a destination MAC address?)
It will send the frame and use its own MAC address as the destination.
It will send an ARP request for the MAC address of the destination device.
It will send the frame with a broadcast MAC address.
It will send a request to the DNS server for the destination MAC address.
It will send an ARP request for the MAC address of the default gateway.
It will send an ARP request for the MAC address of the default gateway.
A client packet is received by a server. The packet has a destination port number of 53. What service is the client requesting?
DNS
NetBIOS (NetBT)
POP3
IMAP
DNS
A network administrator is adding a new LAN to a branch office. The new LAN must support 25 connected devices. What is the smallest network mask that the network administrator can use for the new network?
255.255.255.128
255.255.255.192
255.255.255.224
255.255.255.240
255.255.255.224
What characteristic describes a Trojan horse?
malicious software or code running on an end device
an attack that slows or crashes a device or network service
the use of stolen credentials to access private data
a network device that filters access and traffic coming into a network
malicious software or code running on an end device
What service is provided by HTTPS?
Uses encryption to provide secure remote access to network devices and servers.
Resolves domain names, such as cisco.com, into IP addresses.
Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.
Allows remote access to network devices and servers.
Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.
A technician with a PC is using multiple applications while connected to the Internet. How is the PC able to keep track of the data flow between multiple application sessions and have each application receive the correct packet flows?
The data flow is being tracked based on the destination MAC address of the technician PC.
The data flow is being tracked based on the source port number that is used by each application.
The data flow is being tracked based on the source IP address that is used by the PC of the technician.
The data flow is being tracked based on the destination IP address that is used by the PC of the technician.
The data flow is being tracked based on the source port number that is used by each application.
Explanation:
The source port number of an application is randomly generated and used to individually keep track of each session connecting out to the Internet. Each application will use a unique source port number to provide simultaneous communication from multiple applications through the Internet.
A network administrator is adding a new LAN to a branch office. The new LAN must support 61 connected devices. What is the smallest network mask that the network administrator can use for the new network?
255.255.255.240
255.255.255.224
255.255.255.192
255.255.255.128
255.255.255.192
Refer to the exhibit. Match the network with the correct IP address and prefix that will satisfy the usable host addressing requirements for each network. (Not all options are used.)
VER IMAGEM
Explanation:
Network A needs to use 192.168.0.0 /25 which yields 128 host addresses.
Network B needs to use 192.168.0.128 /26 which yields 64 host addresses.
Network C needs to use 192.168.0.192 /27 which yields 32 host addresses.
Network D needs to use 192.168.0.224 /30 which yields 4 host addresses.
What characteristic describes a DoS attack?
the use of stolen credentials to access private data
a network device that filters access and traffic coming into a network
software that is installed on a user device and collects information about the user
an attack that slows or crashes a device or network service
an attack that slows or crashes a device or network service
Match the application protocols to the correct transport protocols.
VER IMAGEM
What service is provided by SMTP?
Allows clients to send email to a mail server and the servers to send email to other servers.
Allows remote access to network devices and servers.
Uses encryption to provide secure remote access to network devices and servers.
An application that allows real-time chatting among remote users.
Allows clients to send email to a mail server and the servers to send email to other servers.
Which scenario describes a function provided by the transport layer?
A student is using a classroom VoIP phone to call home. The unique identifier burned into the phone is a transport layer address used to contact another network device on the same network.
A student is playing a short web-based movie with sound. The movie and sound are encoded within the transport layer header.
A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window.
A corporate worker is accessing a web server located on a corporate network. The transport layer formats the screen so the web page appears properly no matter what device is being used to view the web site.
A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window.
Explain:
The source and destination port numbers are used to identify the correct application and window within that application.
Refer to the exhibit. Host B on subnet Teachers transmits a packet to host D on subnet Students. Which Layer 2 and Layer 3 addresses are contained in the PDUs that are transmitted from host B to the router?
Layer 2 destination address = 00-00-0c-94-36-ab
Layer 2 source address = 00-00-0c-94-36-bb
Layer 3 destination address = 172.16.20.200
Layer 3 source address = 172.16.10.200
Layer 2 destination address = 00-00-0c-94-36-dd
Layer 2 source address = 00-00-0c-94-36-bb
Layer 3 destination address = 172.16.20.200
Layer 3 source address = 172.16.10.200
Layer 2 destination address = 00-00-0c-94-36-cd
Layer 2 source address = 00-00-0c-94-36-bb
Layer 3 destination address = 172.16.20.99
Layer 3 source address = 172.16.10.200
Layer 2 destination address = 00-00-0c-94-36-ab
Layer 2 source address = 00-00-0c-94-36-bb
Layer 3 destination address = 172.16.20.200
Layer 3 source address = 172.16.100.200
Layer 2 destination address = 00-00-0c-94-36-ab
Layer 2 source address = 00-00-0c-94-36-bb
Layer 3 destination address = 172.16.20.200
Layer 3 source address = 172.16.10.200
- What does the term “attenuation” mean in data communication?
strengthening of a signal by a networking device
leakage of signals from one cable pair to another
time for a signal to reach its destination
loss of signal strength as distance increases
loss of signal strength as distance increases
Explanation: Data is transmitted on copper cables as electrical pulses. A detector in the network interface of a destination device must receive a signal that can be successfully decoded to match the signal sent. However, the farther the signal travels, the more it deteriorates. This is referred to as signal attenuation.
Refer to the exhibit. An administrator is trying to configure the switch but receives the error message that is displayed in the exhibit. What is the problem?
The entire command, configure terminal, must be used.
The administrator is already in global configuration mode.
The administrator must first enter privileged EXEC mode before issuing the command.
The administrator must connect via the console port to access global configuration mode.
VER IMAGEM
R: The administrator must first enter privileged EXEC mode before issuing the command.
Which two protocols operate at the top layer of the TCP/IP protocol suite? (Choose two.)
TCP
IP
UDP
POP
DNS
Ethernet
POP
DNS
A company has a file server that shares a folder named Public. The network security policy specifies that the Public folder is assigned Read-Only rights to anyone who can log into the server while the Edit rights are assigned only to the network admin group. Which component is addressed in the AAA network service framework?
automation
accounting
authentication
authorization
authorization
After a user is successfully authenticated (logged into the server), the authorization is the process of determining what network resources the user can access and what operations (such as read or edit) the user can perform.
What three requirements are defined by the protocols used in network communcations to allow message transmission across a network? (Choose three.)
message size
message encoding
connector specifications
media selection
delivery options
end-device installation
message size
message encoding
delivery options
What are two characteristics of IP? (Choose two.)
does not require a dedicated end-to-end connection
operates independently of the network media
retransmits packets if errors occur
re-assembles out of order packets into the correct order at the receiver end
guarantees delivery of packets
does not require a dedicated end-to-end connection
operates independently of the network media
Explain:
The Internet Protocol (IP) is a connectionless, best effort protocol. This means that IP requires no end-to-end connection nor does it guarantee delivery of packets. IP is also media independent, which means it operates independently of the network media carrying the packets.
An employee of a large corporation remotely logs into the company using the appropriate username and password. The employee is attending an important video conference with a customer concerning a large sale. It is important for the video quality to be excellent during the meeting. The employee is unaware that after a successful login, the connection to the company ISP failed. The secondary connection, however, activated within seconds. The disruption was not noticed by the employee or other employees.
What three network characteristics are described in this scenario? (Choose three.)
security
quality of service
scalability
powerline networking
integrity
fault tolerance
security
quality of service
fault tolerance
What are two common causes of signal degradation when using UTP cabling? (Choose two.)
improper termination
low-quality shielding in cable
installing cables in conduit
low-quality cable or connectors
loss of light over long distances
improper termination
low-quality cable or connectors
Explanation: When terminated improperly, each cable is a potential source of physical layer performance degradation.
Which subnet would include the address 192.168.1.96 as a usable host address?
192.168.1.64/26
192.168.1.32/27
192.168.1.32/28
192.168.1.64/29
192.168.1.64/26
Refer to the exhibit. On the basis of the output, which two statements about network connectivity are correct? (Choose two.)
This host does not have a default gateway configured.
There are 4 hops between this device and the device at 192.168.100.1.
There is connectivity between this device and the device at 192.168.100.1.
The connectivity between these two hosts allows for videoconferencing calls.
The average transmission time between the two hosts is 2 milliseconds.
VER IMAGEM
R: There are 4 hops between this device and the device at 192.168.100.1.
There is connectivity between this device and the device at 192.168.100.1.
Explain:
The output displays a successful Layer 3 connection between a host computer and a host at 19.168.100.1. It can be determined that 4 hops exist between them and the average transmission time is 1 milliseconds. Layer 3 connectivity does not necessarily mean that an application can run between the hosts.
Which two statements describe how to assess traffic flow patterns and network traffic types using a protocol analyzer? (Choose two.)
Capture traffic on the weekends when most employees are off work.
Capture traffic during peak utilization times to get a good representation of the different traffic types.
Only capture traffic in the areas of the network that receive most of the traffic such as the data center.
Perform the capture on different network segments.
Only capture WAN traffic because traffic to the web is responsible for the largest amount of traffic on a network.
Capture traffic during peak utilization times to get a good representation of the different traffic types.
Perform the capture on different network segments.
Explanation: Traffic flow patterns should be gathered during peak utilization times to get a good representation of the different traffic types. The capture should also be performed on different network segments because some traffic will be local to a particular segment.
What is the consequence of configuring a router with the ipv6 unicast-routing global configuration command?
All router interfaces will be automatically activated.
The IPv6 enabled router interfaces begin sending ICMPv6 Router Advertisement messages.
Each router interface will generate an IPv6 link-local address.
It statically creates a global unicast address on this router.
The IPv6 enabled router interfaces begin sending ICMPv6 Router Advertisement messages.
Which three layers of the OSI model map to the application layer of the TCP/IP model? (Choose three.)
application
network
data link
session
presentation
transport
application
session
presentation
Refer to the exhibit. If PC1 is sending a packet to PC2 and routing has been configured between the two routers, what will R1 do with the Ethernet frame header attached by PC1?
nothing, because the router has a route to the destination network
open the header and use it to determine whether the data is to be sent out S0/0/0
open the header and replace the destination MAC address with a new one
remove the Ethernet header and configure a new Layer 2 header before sending it out S0/0/0
VER IMAGEM
R: remove the Ethernet header and configure a new Layer 2 header before sending it out S0/0/0
Explanation: When PC1 forms the various headers attached to the data one of those headers is the Layer 2 header. Because PC1 connects to an Ethernet network, an Ethernet header is used. The source MAC address will be the MAC address of PC1 and the destination MAC address will be that of G0/0 on R1. When R1 gets that information, the router removes the Layer 2 header and creates a new one for the type of network the data will be placed onto (the serial link).
What will happen if the default gateway address is incorrectly configured on a host?
The host cannot communicate with other hosts in the local network.
The host cannot communicate with hosts in other networks.
A ping from the host to 127.0.0.1 would not be successful.
The host will have to use ARP to determine the correct address of the default gateway.
The switch will not forward packets initiated by the host.
The host cannot communicate with hosts in other networks.
What are two features of ARP? (Choose two.)
When a host is encapsulating a packet into a frame, it refers to the MAC address table to determine the mapping of IP addresses to MAC addresses.
An ARP request is sent to all devices on the Ethernet LAN and contains the IP address of the destination host and its multicast MAC address.
If a host is ready to send a packet to a local destination device and it has the IP address but not the MAC address of the destination, it generates an ARP broadcast.
If no device responds to the ARP request, then the originating node will broadcast the data packet to all devices on the network segment.
If a device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply.
If a host is ready to send a packet to a local destination device and it has the IP address but not the MAC address of the destination, it generates an ARP broadcast.
If a device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply.
A network administrator is adding a new LAN to a branch office. The new LAN must support 90 connected devices. What is the smallest network mask that the network administrator can use for the new network?
255.255.255.128
255.255.255.240
255.255.255.248
255.255.255.224
255.255.255.128
What are two ICMPv6 messages that are not present in ICMP for IPv4? (Choose two.)
Neighbor Solicitation
Destination Unreachable
Host Confirmation
Time Exceeded
Router Advertisement
Route Redirection
Neighbor Solicitation
Router Advertisement
A client packet is received by a server. The packet has a destination port number of 80. What service is the client requesting?
DHCP
SMTP
DNS
HTTP
HTTP
What is an advantage for small organizations of adopting IMAP instead of POP?
POP only allows the client to store messages in a centralized way, while IMAP allows distributed storage.
Messages are kept in the mail servers until they are manually deleted from the email client.
When the user connects to a POP server, copies of the messages are kept in the mail server for a short time, but IMAP keeps them for a long time.
IMAP sends and retrieves email, but POP only retrieves email.
Messages are kept in the mail servers until they are manually deleted from the email client.
Explanation: IMAP and POP are protocols that are used to retrieve email messages. The advantage of using IMAP instead of POP is that when the user connects to an IMAP-capable server, copies of the messages are downloaded to the client application. IMAP then stores the email messages on the server until the user manually deletes those messages.
A technician can ping the IP address of the web server of a remote company but cannot successfully ping the URL address of the same web server. Which software utility can the technician use to diagnose the problem?
tracert
ipconfig
netstat
nslookup
nslookup
Explain:
Traceroute (tracert) is a utility that generates a list of hops that were successfully reached along the path from source to destination.This list can provide important verification and troubleshooting information. The ipconfig utility is used to display the IP configuration settings on a Windows PC. The Netstat utility is used to identify which active TCP connections are open and running on a networked host. Nslookup is a utility that allows the user to manually query the name servers to resolve a given host name. This utility can also be used to troubleshoot name resolution issues and to verify the current status of the name servers.
Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)
implements CSMA/CD over legacy shared half-duplex media
enables IPv4 and IPv6 to utilize the same physical medium
integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper
implements a process to delimit fields within an Ethernet 2 frame
places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame
Other case:
responsible for internal structure of Ethernet frame
applies source and destination MAC addresses to Ethernet frame
handles communication between upper layer networking software and Ethernet NIC hardware
adds Ethernet control information to network protocol data
implements trailer with frame check sequence for error detection
Other case:
integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper
places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame
implements CSMA/CD over legacy shared half-duplex media
adds Ethernet control information to network protocol data
applies source and destination MAC addresses to Ethernet frame
Other case:
enables IPv4 and IPv6 to utilize the same physical medium
adds Ethernet control information to network protocol data
applies source and destination MAC addresses to Ethernet frame
responsible for the internal structure of Ethernet frame
implements trailer with frame check sequence for error detection
Other case:
enables IPv4 and IPv6 to utilize the same physical medium
applies source and destination MAC addresses to Ethernet frame
integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper
handles communication between upper layer networking software and Ethernet NIC hardware
responsible for internal structure of Ethernet frame
enables IPv4 and IPv6 to utilize the same physical medium
places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame
OTHER CASE:
handles communication between upper layer networking software and Ethernet NIC hardware
adds Ethernet control information to network protocol data
OTHER CASE:
places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame
adds Ethernet control information to network protocol data
OTHER CASE:
enables IPv4 and IPv6 to utilize the same physical medium
adds Ethernet control information to network protocol data
OTHER CASE:
enables IPv4 and IPv6 to utilize the same physical medium
handles communication between upper layer networking software and Ethernet NIC hardware
Explanation: The data link layer is actually divided into two sublayers:
+ Logical Link Control (LLC): This upper sublayer defines the software processes that provide services to the network layer protocols. It places information in the frame that identifies which network layer protocol is being used for the frame. This information allows multiple Layer 3 protocols, such as IPv4 and IPv6, to utilize the same network interface and media.
+ Media Access Control (MAC): This lower sublayer defines the media access processes performed by the hardware. It provides data link layer addressing and delimiting of data according to the physical signaling requirements of the medium and the type of data link layer protocol in use.
The global configuration command ip default-gateway 172.16.100.1 is applied to a switch. What is the effect of this command?
The switch can communicate with other hosts on the 172.16.100.0 network.
The switch can be remotely managed from a host on another network.
The switch is limited to sending and receiving frames to and from the gateway 172.16.100.1.
The switch will have a management interface with the address 172.16.100.1.
The switch can be remotely managed from a host on another network.
Explanation: A default gateway address is typically configured on all devices to allow them to communicate beyond just their local network.In a switch this is achieved using the command ip default-gateway <ip>.</ip>
What happens when the transport input ssh command is entered on the switch vty lines?
The SSH client on the switch is enabled.
The switch requires a username/password combination for remote access.
Communication between the switch and remote users is encrypted.
The switch requires remote connections via a proprietary client software.
Communication between the switch and remote users is encrypted.
Explanation: The transport input ssh command when entered on the switch vty (virtual terminal lines) will encrypt all inbound controlled telnet connections.
Match the type of threat with the cause. (Not all options are used.)
VER IMAGEM
A disgruntled employee is using some free wireless networking tools to determine information about the enterprise wireless networks. This person is planning on using this information to hack the wireless network. What type of attack is this?
DoS
access
reconnaissance
Trojan horse
reconnaissance
Explanation: A reconnaissance attack is the unauthorized discovery and documentation of various computing networks, network systems, resources, applications, services, or vulnerabilities.
What service is provided by HTTP?
Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.
Allows for data transfers between a client and a file server.
An application that allows real-time chatting among remote users.
A basic set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the web.
A basic set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the web.
A client packet is received by a server. The packet has a destination port number of 67. What service is the client requesting?
FTP
DHCP
Telnet
SSH
DHCP
What are two problems that can be caused by a large number of ARP request and reply messages? (Choose two.)
Switches become overloaded because they concentrate all the traffic from the attached subnets.
The ARP request is sent as a broadcast, and will flood the entire subnet.
The network may become overloaded because ARP reply messages have a very large payload due to the 48-bit MAC address and 32-bit IP address that they contain.
A large number of ARP request and reply messages may slow down the switching process, leading the switch to make many changes in its MAC table.
All ARP request messages must be processed by all nodes on the local network.
The ARP request is sent as a broadcast, and will flood the entire subnet.
All ARP request messages must be processed by all nodes on the local network.
Explanation: ARP requests are sent as broadcasts:
(1) All nodes will receive them, and they will be processed by software, interrupting the CPU.
(2) The switch forwards (floods) Layer 2 broadcasts to all ports.
A switch does not change its MAC table based on ARP request or reply messages. The switch populates the MAC table using the source MAC address of all frames. The ARP payload is very small and does not overload the switch.
A group of Windows PCs in a new subnet has been added to an Ethernet network. When testing the connectivity, a technician finds that these PCs can access local network resources but not the Internet resources. To troubleshoot the problem, the technician wants to initially confirm the IP address and DNS configurations on the PCs, and also verify connectivity to the local router. Which three Windows CLI commands and utilities will provide the necessary information? (Choose three.)
netsh interface ipv6 show neighbor
arp -a
tracert
ping
ipconfig
nslookup
telnet
ping
ipconfig
nslookup
During the process of forwarding traffic, what will the router do immediately after matching the destination IP address to a network on a directly connected routing table entry?
analyze the destination IP address
switch the packet to the directly connected interface
look up the next-hop address for the packet
discard the traffic after consulting the route table
switch the packet to the directly connected interface
Explanation: A router receives a packet on an interface and looks at the destination IP address. It consults its routing table and matches the destination IP address to a routing table entry. The router then discovers that it has to send the packet to the next-hop address or out to a directly connected interface. When the destination address is on a directly connected interface, the packet is switched over to that interface.
What characteristic describes antispyware?
applications that protect end devices from becoming infected with malicious software
a network device that filters access and traffic coming into a network
software on a router that filters traffic based on IP addresses or applications
a tunneling protocol that provides remote users with secure access into the network of an organization
applications that protect end devices from becoming infected with malicious software
