Prep test 4 Flashcards
Question 1 of 90
Which of the following pairs of networks refer to a circuit-switched and a packet-switched network respectively?
Answers
A.
An Ethernet based data network and an IP-based enterprise network
B.
An IP based enterprise network and the Public Switched Telephone Network
C.
Public Switched Telephone Network and an IP-based enterprise network
D.
An IP-based enterprise network and a Wi-Fi based metropolitan wireless network
C.
Public Switched Telephone Network and an IP-based enterprise network
A circuit-switched network creates a dedicated communication path between the communicating devices which is maintained until the communication ends. The traditional Public Switched Telephone Network (PSTN) is one such network. A packet-switched network is one where data is grouped into packets that are sent individually over a network. Each packet is directed over the network independently based on the addressing information found within its header. Modern IP-based networks are packet-switched networks.
Question 3 of 90
You are asked to design a wireless network where security and privacy are of paramount importance. Which of the following protocols would you avoid using and why?
Answers
A.
WPA2 because it uses clear text passwords
B.
EAP-TLS because it provides an open network
C.
WPA2 because it does not provide the strongest encryption
D.
WPA because it uses clear text passwords
E.
WPA because it does not provide the strongest encryption
E.
WPA because it does not provide the strongest encryption
Wi-Fi Protected Access (WPA) and Wi-Fi Protected Access II (WPA2) are two security protocols and security certification programs developed by the Wi-Fi Alliance to secure wireless computer networks. The Alliance defined these in response to serious weaknesses researchers had found in the previous system, Wired Equivalent Privacy (WEP). WPA is no longer considered a secure solution and has been replaced by WPA2 which provides a stronger encryption mechanism using CCMP-AES.
Question 14 of 90 You have multiple virtual machines running on your network. Which address conflict can cause the devices to malfunction at Layer 2? Answers A. Duplicate TCP ports B. Duplicate MAC addresses C. Duplicate physical bit addresses D. Duplicate IP addresses
B.
Duplicate MAC addresses
MAC addresses should be unique on all network devices worldwide. However, there is a slight possibility that they may be duplicated especially on equipment that has been procured from more economical and less well-known manufacturers. This may result in a duplicate MAC address on a subnet. This results in ARP tables of hosts and MAC tables of switches continually being updated alternately from frames transmitted by each device.
Question 15 of 90
You have installed and configured a Layer 3 switch with multiple VLANs. Which of the following can be accomplished by this switch that a Layer 2 switch cannot perform?
Answers
A.
Use Quality of Service (QoS) feature
B.
Use Simple Network Management Protocol (SNMP)
C.
Configure, manage, and monitor a LAN
D.
Perform routing functions with multiple VLANs
D.
Perform routing functions with multiple VLANs
The configuration of VLANs is inherent to layer two devices, specifically, switches. VLANs however are only configurable on managed switches, as unmanaged switches do not possess the appropriate software and capabilities for such configurations. In this scenario, except for performing routing functions, a Layer 2 switch will be able to perform all functions. Therefore, Layer 3 switch is required to perform a routing function. A router can be an alternate to Layer 3 switch as far as routing is concerned.
Question 17 of 90 You are required to set up a new wireless network in your office. One of the key requirements is that the wireless network should support video streaming at a very high throughput rate. Multiple users may stream videos at the same time. Which wireless network will meet your requirement? Answers A. 802.11a B. 802.11g C. 802.11n D. 802.11ac E. 802.11b
D.
802.11ac
IEEE 802.11ac is an amendment that improves upon the previous IEEE 802.11 standards. Characteristics of this standard include the introduction of wider channels (80 or 160 MHz compared to 40 MHz for 802.11n) in the 5 GHz band, more spatial streams (up to eight) and the addition of Multi-user MIMO (MU-MIMO). Out of the given choice, this is the only wireless specification that provides Very High Throughput (VHT) data up to 7 Gbps within the 5.8 GHz ISM band.
Question 30 of 90
Which of the following protocols are examples of connection-oriented protocols? [Choose two that apply.]
Answers
A.
ICMP
B.
NetBEUI
C.
MPLS
D.
ATM
C.
MPLS
D.
ATM
Connection-less describes a network communication mode where data is individually addressed and routed based on information carried in each unit. Under such a situation, data can be sent from one node to another without any prior arrangement, and without even the sender knowing if the receiver is available or even extant. ATM and MPLS are examples of connection-oriented protocols. ICMP and NetBEUI are connection-less protocols.
Question 33 of 90 Which of the following is a protocol data unit? Answers A. An application layer protocol unit B. A transport layer segment C. A physical layer encoding method D. The sum of the source and destination MAC addresses in a frame E. The IP address and port pair of a session
B.
A transport layer segment
A protocol data unit (PDU) is the generic term for the entity of data that is produced at each layer of the OSI model. For example, the PDU of the Datalink layer is called a frame, that of the network layer is called a packet and at the transport layer it is called segment. Some may also call a bit of data the PDU of the physical layer, although that is not as generally accepted as the other PDUs.
Question 36 of 90
Which of the following two methods can help prevent a DNS poisoning attack? [Choose all that apply].
Answers
A. Configure DNS to fetch updates from known authoritative servers B. Setting short TTL times C. Configure firewall to filter out traffic only from known DNS servers D. Clearing the DNS caches of local systems and network devices
B Setting short TTL times
D Clearing the DNS caches of local systems and network devices at regular intervals
DNS poisoning also referred to as DNS spoofing, is a form of computer security hacking in which corrupt DNS data is introduced into the DNS resolver’s cache, causing the name server to return an incorrect IP address. This results in traffic being diverted to another computer, often to the attacker’s computer, where the attacker can attempt to decipher the data sent.
Question 39 of 90
Which of the following features of networking are a part of the Datalink layer of the OSI model? [Choose two that apply.]
Answers
A.
Type of cable used
B.
Hardware addressing
C.
Type of connector used
D.
Acknowledgements of received data
E.
Media Access Control mechanisms
B.
Hardware addressing
D.
Acknowledgements of received data
The Datalink layer of the OSI model provides the means to transfer data between network nodes. It is concerned with media access control methods, hardware addressing and the local delivery of frames between devices on the same network segment.
Question 42 of 90
You are provided with an IP address range of 192.168.55.0/24. You are required to perform subnetting so that you provide three address spaces sufficient to accommodate 93, 55 and 42 hosts respectively. Which of the following subnetting schemes will provide for this?
Answers
A.
Subnet 1: 192.168.55.0/25 Subnet 2: 192.168.55.128/26 Subnet3: 192.168.55.192/26
B.
Subnet 1: 192.168.55.0/26 Subnet 2: 192.168.55.64/27 Subnet3: 192.168.128.0/27
C.
Subnet 1: 192.168.55.0/25 Subnet 2: 192.168.55.64/26 Subnet3: 192.168.128.0/26
D.
Subnet 1: 192.168.55.0/26 Subnet 2: 192.168.55.128/27 Subnet3: 192.168.192.0/27
A.
Subnet 1: 192.168.55.0/25 Subnet 2: 192.168.55.128/26 Subnet3: 192.168.55.192/26
The IP address range provides for 256 IP addresses (254 hosts). This range can be subnetted into sizes of 128, 64, 32, 16 and so on. For the sizes required, one 128-address subnet and two 64-address subnets will suffice. These three subnets will take up the whole range of the original address space (128+64+64=256). A 128-address subnet has a subnet mask of 255.255.255.128 or a /25 prefix, so the first subnet is 192.168.55.0/25. This subnet ranges from 192.168.55.0 to 192.168.55.127. The next available network address is 192.168.55.128. A 64-address subnet has a subnet mask of 255.255.255.192 or a /26 prefix, so the second subnet is 192.168.55.128/26. This subnet ranges from 192.168.55.128 to 192.168.55.191. The next available network address is 192.168.55.192. A 64-address subnet has a subnet mask of 255.255.255.192 or a /26 prefix, so the third subnet is 192.168.55.192/26. This subnet ranges from 192.168.55.192
Question 48 of 90 When you start your DSL modem to connect to the Internet Service Provider (ISP), which phase does PPPoE initiate? Answers A. Establish B. Connect C. Search D. Discovery
D.
Discovery
The Point-to-Point Protocol over Ethernet (PPPoE) is a network protocol for encapsulating PPP frames inside Ethernet frames. When you start the DSL modem, the PPPoE protocol initiates the Discovery phase in which user session and remote site session learn about each other’s network addresses.
Question 49 of 90 You create a five-meter T-568A standard straight cable to connect a user PC to the wall jack. After connecting the PC, you notice that the PC does not have connectivity. After basic troubleshooting, you decide to test the cable using the cable tester. If the test fails, which of the following wires in the cable is likely to be causing the problem? Answers A. White blue B. White orange C. Blue D. White green
D.
White green
A cable tester is a device used to test Ethernet cable connections as well as telephony cable connections. When you test a cable and it fails the test, it is most likely that the White green is responsible for this failure
Question 50 of 90 You have several servers in your server room that are running different operating systems including several flavors of Linux and several versions of Windows. You want to ensure that you can obtain a remote desktop connection to these systems. You want to minimize the administrative overhead by using multiple applications. Which of the following should help you achieve your goal? Answers A. VNC B. RDP C. SSH D. FreeRemote E. Telnet
A.
VNC
Virtual Network Computing (VNC) is a platform independent graphical desktop sharing system that allows one computer to remotely control another. It transmits the keyboard and mouse events from one computer to another, relaying the graphical screen updates back in the other direction, over a network.
Question 51 of 90 After testing some copper UTP cabling for possible connectivity problems, you use a cable tester and notice that all eight conductors are functioning except for one. You examine the pins on each of the two RJ-45 connectors and observe no problems. Which of the following has most likely occurred to this cable? Answers A. Incorrect pin-out B. A transceiver mismatch C. An open circuit D. A short circuit
C.
An open circuit
A short circuit, sometimes abbreviated to short, is an electrical circuit that allows a current to travel along an unintended path with no or a very low electrical impedance. In UTP cabling, this will cause signals intended to travel on one wire to freely travel on another thus adding the two signals together. This results in an unintelligible signal that produces errors and in most cases, disrupt communication completely. The opposite of a short circuit is an “open circuit”, which is an infinite resistance (essentially a break in the conductor) between two nodes.
Question 59 of 90 You need to design a new wireless network for a client. At present, travel to the client location is not feasible for you. Since you are not getting paid for this survey, you also want lower efforts to be involved. The client has also said that they want the estimated number of access points and the calculation need not be exact but close the real number required. To be able to meet these criteria, which of the following type of survey would be suitable for this scenario? Answers A. Active site survey B. RF spectrum site survey C. Passive site survey D. Predictive site survey Assistance
D.
Predictive site survey
Assistance
