Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.

Which command will display the CHAP authentication process as it occurs between two routers in the network?

Answer» The command debug ppp authentication will show you the authentication process that PPP uses between point-to-point connections.
Discussion
2.

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» 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.
Discussion
3.

Which encapsulations can be configured on a serial interface?

Answer» 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.
Discussion
4.

When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?

Answer» 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.
Discussion
5.

Which command is required for connectivity in a Frame Relay network if Inverse ARP is not operational?

Answer» If you have a router in your Frame Relay network that does not support IARP, you must create Frame Relay maps on your router, which provide known DLCI-to-IP address mappings.
Discussion
6.

A default Frame Relay WAN is classified as what type of physical network?

Answer» 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.
Discussion
7.

Which WAN encapsulations can be configured on an asynchronous serial connection?

Answer» 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.
Discussion