As mentioned in the introduction, you have two choices for review questions. The questions that follow give you a bigger challenge than the exam itself by using 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. The answers to these questions are found in Appendix A.
For more practice with exam-like question formats, including questions using a router simulator and multiple-choice questions, use the exam engine on the CD.
1. Create a minimal configuration enabling IP on each interface on a 2501 router (two serial, one Ethernet). The NIC assigned you network 126.96.36.199. Your boss says that you need, at most, 200 hosts per subnet. You decide against using VLSM. Your boss also says to plan your subnets so that you can have as many subnets as possible rather than allow for larger subnets later. When choosing the actual IP address values and subnet numbers, you decide to start with the lowest numerical values. Assume that point-to-point serial links will be attached to this router.
2. In the previous question, what would be the IP subnet of the link attached to serial 0? If another user wanted to answer the same question but did not have the enable password, what command(s) might provide this router's addresses and subnets?
3. What must be done to make the output of the show ip route command list subnet masks in decimal format instead of prefixes? In what mode would you use the command?
4. What are the differences between the clock rate and bandwidth commands?
5. Compare and contrast the commands used to set the enable, console, and telnet passwords on a router.
6. In the output of show ip route, when a C shows up in the left side of the output on a line for a particular route, what does that mean?
7. Define the term prefix notation. Give two examples.
8. What does ICMP stand for? To which OSI layer would you consider this protocol to apply most closely?
9. Identify two methods to tell a router to ask for name resolution from two different name servers.
10. What keyboard sequence suspends a Telnet session in a Cisco router?
11. What two commands, and what part the command output, tells you which suspended Telnet connection will be reconnected if you just press the Enter key, without any characters typed on the command line?
12. Imagine that you typed a ping command and got 5 "!" back. What type of messages were sent through the network? Be as specific as possible.
13. How do you make a router not ask for DNS resolution from a name server?
14. Imagine that you are just logged in at the console of R1, and you Telnet to routers R2, R3, and R4 in succession, but you suspended your Telnet connection each time—in other words, all three Telnet connections go from R1 to the other three routers, respectively. What options do you have for reconnecting to R2?
15. Imagine that you are just logged in at the console of R1, and you Telnet to routers R2, R3, and R4 in succession, but you suspended your Telnet connection each time—in other words, all three Telnet connections go from R1 to the other three routers, respectively. What options do you have for reconnecting to R4?
16. List the five key pieces of information that can be gathered using CDP, as mentioned in the chapter.
17. Imagine a network with Switch1, connected to Router1, with a point-to-point serial link to Router2, which, in turn, is connected to Switch2. Assuming that you are logged into R1, what commands could be used to find the IP addresses of Router2 and Switch1 without logging in to either device?
18. Imagine that a network with Switch1 is connected to Router1, with a point-to-
point serial link to Router2, which, in turn, is connected to Switch2. You can log in only to Switch1. Which of the other devices could Switch1 learn about using CDP? Why?
19. What command lists a brief one-line description of CDP information about each neighbor?
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