Wide Area Networks(Networking ) Questions and Answers

Question 1. When setting up Frame Relay for point-to-point subinterfaces, which of the following must not be configured?
  1.    The Frame Relay encapsulation on the physical interface
  2.    The local DLCI on each subinterface
  3.    An IP address on the physical interface
  4.    The subinterface type as point-to-point
  5.    PAP
Explanation:-
Answer: Option C. -> An IP address on the physical interface
It is very important to remember when studying the CCNA exam objectives, and when configuring Frame Relay with point-to-point subinterfaces, that you do not put an IP address on the physical interface.
Question 2. Which command will display the CHAP authentication process as it occurs between two routers in the network?
  1.    show chap authentication
  2.    show interface serial 0
  3.    debug ppp authentication
  4.    debug chap authentication
Explanation:-
Answer: Option C. -> debug ppp authentication
The command debug ppp authentication will show you the authentication process that PPP uses between point-to-point connections.
Question 3. The Acme Corporation is implementing dial-up services to enable remote-office employees to connect to the local network. The company uses multiple routed protocols, needs authentication of users connecting to the network, and since some calls will be long distance, needs callback support. Which of the following protocols is the best choice for these remote services?
  1.    802.1
  2.    Frame Relay
  3.    HDLC
  4.    PPP
  5.    PAP
Explanation:-
Answer: Option D. -> PPP
PPP is your only option, as HDLC and Frame Relay do not support these types of business requirements. PPP provides dynamic addressing, authentication using PAP or CHAP, and callback services.
Question 4. You need to configure a router for a Frame Relay connection to a non-Cisco router. Which of the following commands will prepare the WAN interface of the router for this connection?
  1.    Router(config-if)# encapsulation frame-relay q933a
  2.    Router(config-if)# encapsulation frame-relay ansi
  3.    Router(config-if)# encapsulation frame-relay ietf
  4.    Router(config-if)# encapsulation frame-relay cisco
Explanation:-
Answer: Option C. -> Router(config-if)# encapsulation frame-relay ietf
If you have a Cisco router on one side of a Frame Relay network and a non-Cisco router on the other side, you would need to use the Frame Relay encapsulation type of IETF. The default is Cisco encapsulation, which means that a Cisco router must be on both sides of the Frame Relay network.
Question 5. Which WAN encapsulations can be configured on an asynchronous serial connection?
1. PPP
2. ATM
3. HDLC
4. SDLC
5. Frame Relay
  1.    1 and 2
  2.    2 and 4
  3.    3, 4 and 5
  4.    All of the above
Explanation:-
Answer: Option A. -> 1 and 2
Please do not freak out because ATM is an answer to this question. ATM is not covered in depth on the CCNA exam. PPP is mostly used for dial-up (async) services, but ATM could be used as well, though it typically is not used anymore since PPP is so efficient.
Question 6. Which encapsulations can be configured on a serial interface?
1. Ethernet
2. Token Ring
3. HDLC
4. Frame Relay
5. PPP
  1.    1 and 4
  2.    2 only
  3.    3, 4 and 5
  4.    All of the above
Explanation:-
Answer: Option C. -> 3, 4 and 5
Ethernet and Token Ring are LAN technologies and cannot be configured on a serial interface. PPP, HDLC, and Frame Relay are layer 2 WAN technologies that are typically configured on a serial interface.
Question 7. Which of the following command options are displayed when you use the Router# show frame-relay ? command?
1. dlci
2. neighbors
3. lmi
4. pvc
5. map
  1.    1 only
  2.    2 and 4
  3.    3, 4 and 5
  4.    All of the above
Explanation:-
Answer: Option C. -> 3, 4 and 5
The show frame-relay ? command provides many options, but the options available in this question are lmi, pvc, and map.
Question 8. In which of the following technologies is the term HFC used?
  1.    DSL
  2.    PPPoE
  3.    Frame Relay
  4.    Dedicated T1
Explanation:-
Answer: Option D. -> Dedicated T1
In a modern network, hybrid fibre-coaxial (HFC) is a telecommunications industry term for a network that incorporates both optical fiber and coaxial cable to create a broadband network.
Question 9. A default Frame Relay WAN is classified as what type of physical network?
  1.    Point-to-point
  2.    Broadcast multi-access
  3.    Non-broadcast multi-access
  4.    Non-broadcast multipoint
Explanation:-
Answer: Option C. -> Non-broadcast multi-access
Frame Relay, by default, is a non-broadcast multi-access (NBMA) network, which means that broadcasts, such as RIP updates, will not be forwarded across the link by default.
Question 10. Suppose that you have a customer who has a central HQ and six branch offices. They anticipate adding six more branches in the near future. They wish to implement a WAN technology that will allow the branches to economically connect to HQ and you have no free ports on the HQ router. Which of the following would you recommend?
  1.    PPP
  2.    HDLC
  3.    Frame Relay
  4.    ISDN
Explanation:-
Answer: Option C. -> Frame Relay
The key is "there are no free ports" on your router. Only Frame Relay can provide a connection to multiple locations with one interface, and in an economical manner no less.
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