Exercise: Wide Area Networks

Questions for: Wide Area Networks

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?
A:
PPP
B:
HDLC
C:
Frame Relay
D:
ISDN
Answer: C
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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Which encapsulations can be configured on a serial interface?
  1. Ethernet
  2. Token Ring
  3. HDLC
  4. Frame Relay
  5. PPP
A:
1 and 4
B:
2 only
C:
3, 4 and 5
D:
All of the above
Answer: C
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.
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Which WAN encapsulations can be configured on an asynchronous serial connection?
  1. PPP
  2. ATM
  3. HDLC
  4. SDLC
  5. Frame Relay
A:
1 and 2
B:
2 and 4
C:
3, 4 and 5
D:
All of the above
Answer: A
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.
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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?
A:
Router(config-if)#encapsulation frame-relay q933a
B:
Router(config-if)#encapsulation frame-relay ansi
C:
Router(config-if)#encapsulation frame-relay ietf
D:
Router(config-if)#encapsulation frame-relay cisco
Answer: C
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.
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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?
A:
802.1
B:
Frame Relay
C:
HDLC
D:
PPP
Answer: D
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.
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