Which of the following encapsulates PPP frames in Ethernet frames and uses common PPP features like authentication, encryption, and compression?
Answer: C
PPPoE encapsulates PPP frames in Ethernet frames and uses common PPP features like authentication, encryption, and compression. PPPoA is used for ATM.
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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?
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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When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?
Answer: A
Clocking on a serial interface is always provided by the CSU/DSU (DCE device). However, if you do not have a CSU/DSU in your nonproduction test environment, then you need to supply clocking with the clock rate command on the serial interface of the router with the DCE cable attached.
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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
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 command will display the CHAP authentication process as it occurs between two routers in the network?
Answer: C
The command debug ppp authentication will show you the authentication process that PPP uses between point-to-point connections.
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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
Answer: C
The show frame-relay ? command provides many options, but the options available in this question are lmi, pvc, and map.
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How should a router that is being used in a Frame Relay network be configured to keep split horizon issues from preventing routing updates?
Answer: A
If you have a serial port configured with multiple DLCIs connected to multiple remote sites, split horizon rules, stop route updates received on an interface from being sent out the same interface. By creating subinterfaces for each PVC, you can avoid the split horizon issues when using Frame Relay.
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