As mentioned in the introduction, you have two choices for review questions. The questions that follow give you a bigger challenge than the exam does because they use an open-ended question format. By reviewing now with this more difficult question format, you can exercise your memory better and prove your conceptual and factual knowledge of this chapter. You can find the answers to these questions in Appendix A.

For more practice with exam-like question formats, including questions that use a router simulator and multiple choice format, use the exam engine on the CD.

1. Is it possible to have network layer problems while the addresses are correct and routing is operational and functional?

2. Is it possible to have a network layer problem—such as a router's address being duplicated by another router or device—but see no log messages on the console? Explain.

3. Is it possible that only a percentage of ping messages sent to an IP address succeed? Explain.

4. What does the command route print do? Is it an end system or a Cisco IOS command?

5. Provide three commands—one for Windows NT/2000/XP, one for Windows 9x/Me, and one for UNIX/MAC OS X—that display information about that device's IP settings (address and other information).

6. Which two Cisco IOS commands display and clear the content of the ARP cache table?

7. Which Cisco IOS command displays the list of local router interfaces, their IP addresses, and their physical and logical status?

8. List two Cisco IOS commands that display all BGP neighbors (peers) and the status of their peering with the local router. (One provides more detail than the other.)

9. Which Cisco IOS command displays the content of the BGP table?

10. It is important to use an effective and systematic technique to successfully isolate a problem at the network layer. Provide at least two of the recommended guidelines for isolating network layer problems.

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