Wide Area Networks - Wide Area Networks (2)
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| 9. | In which of the following technologies is the term HFC used? |
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Answer: Option D Explanation: 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. |
| 10. | Which of the following command options are displayed when you use the Router# show frame-relay ? command?
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Answer: Option C Explanation: The show frame-relay ? command provides many options, but the options available in this question are lmi, pvc, and map. |
| 11. | 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? |
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Answer: Option C Explanation: 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. |
| 12. | Which encapsulations can be configured on a serial interface?
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Answer: Option C Explanation: 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. |
| 13. | Which WAN encapsulations can be configured on an asynchronous serial connection?
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Answer: Option A Explanation: 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. |
| 14. | 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? |
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Answer: Option C Explanation: 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. |
| 15. | 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? |
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Answer: Option D Explanation: 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. |
| 16. | Which command will display the CHAP authentication process as it occurs between two routers in the network? |
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Answer: Option C Explanation: The command debug ppp authentication will show you the authentication process that PPP uses between point-to-point connections. |