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C H A P T E R13
Basic Router Configuration and Operation
To configure a Cisco router to route TCP/IP packets, you typically configure an IP address and subnet mask on each interface. You also typically configure a dynamic routing protocol, which discovers the routes in a network. That’s all the configuration that is required to make a Cisco router route IP packets.
In this chapter, you will read about the basic commands to configure IP addresses and IP routing on a Cisco router. You also will read about a variety of commands that you can use to discover how the router is working. By the end of this chapter, you will know how to configure Cisco routers to implement a simple IP network—with the exception that you will not yet have seen how to configure IP routing protocols. Chapter 14, “Introduction to Dynamic Routing Protocols,” covers many of the concepts behind routing protocols, and chapters in the CCNA ICND Exam Certification Guide will show you how to configure several routing protocols.
“Do I Know This Already?” Quiz
The purpose of the “Do I Know This Already?” quiz is to help you decide whether you really need to read the entire chapter. If you already intend to read the entire chapter, you do not necessarily need to answer these questions now.
The ten-question quiz, derived from the major sections in “Foundation Topics” portion of the chapter, helps you determine how to spend your limited study time.
Table 13-1 outlines the major topics discussed in this chapter and the “Do I Know This Already?” quiz questions that correspond to those topics.
Table 13-1 “Do I Know This Already?” Foundation Topics Section-to-Question Mapping
Foundations Topics Section
Configuring IP Addresses
IP Troubleshooting Features
Questions Covered in This Section
1–4
5–10
364 Chapter 13: Basic Router Configuration and Operation
CAUTION The goal of self-assessment is to gauge your mastery of the topics in this chapter. If you do not know the answer to a question or are only partially sure of the answer, you should mark this question wrong for purposes of the self-assessment. Giving yourself credit for an answer that you correctly guess skews your self-assessment results and might provide you with a false sense of security.
1. Which of the following commands is valid for the configuration of IP address 10.1.1.1, mask 255.255.255.0?
a. ip address 10.1.1.1
b. ip address 10.1.1.1 mask 255.255.255.0 c. ip address 10.1.1.1 255.255.255.0
d. ip address 10.1.1.1 prefix /24 e. ip address 10.1.1.1 /24
2. Which of the following must be true before Cisco IOS Software adds a connected route to the routing table?
a. IP address must be configured on an interface.
b. A router must receive a routing update from a neighboring router. c. The ip route command must be added to the configuration.
d. The ip address command must use the special keyword. e. The interface status must be up and up.
3. Which of the following represents the same ideas as mask 255.255.240.0?
a. /16 b. /18 c. /20 d. /22 e. /24 f. /26
g. /192 h. /224 i. /240
“Do I Know This Already?” Quiz 365
4. What command brings up an interface that previously was administratively disabled?
a. no shutdown b. shutdown
c. enable d. up
e. no disable f. disable
5. Imagine that a PC is attached to the same Ethernet as a router. The PC makes a DNS request for host name Fred, and the PC gets a reply showing IP address 10.1.1.1. What command could be issued on the router to list the information learned in that DNS request and reply?
a. show hosts
b. show ip hosts c. show names
d. None of the above
6. Imagine that a neighboring router’s host name is Hannah. Which of these commands could tell you information about the IOS version on Hannah, without Telnetting to Hannah?
a. show neighbor
b. show neighbor Hannah c. show cdp
d. show cdp Hannah e. show cdp interface
f. show cdp neighbor
g. show cdp neighbor Hannah h. show cdp entry hannah
i. show cdp neighbor detail
366 Chapter 13: Basic Router Configuration and Operation
7. What CDP command(s) could identify the model of hardware of a neighbor?
a. show neighbors
b. show neighbors Hannah c. show cdp
d. show cdp Hannah e. show cdp interface
f. show cdp neighbors
g. show cdp entry hannah
h. show cdp neighbors detail
8. Imagine that you used a ping command successfully. What messages would have been sent by the ping command?
a. ICMP ping
b. ICMP echo request
c. ICMP echo management d. ICMP query
9. Imagine that you just erased all the configuration on a router and reloaded it. To configure the router to use a DNS at IP address 10.1.1.1, which of the following commands is required?
a. ip name-server 10.1.1.1 b. ip dns 10.1.1.1
c. ip domain-lookup d. ip dns-lookup
10. Imagine that you just logged in to the console of router R1 and then Telnetted to R2. What must you type to suspend your Telnet connection, going back to R1?
a. suspend b. Ctrl-z
c. Ctrl-Shift-6, then x d. quit
“Do I Know This Already?” Quiz 367
The answers to the “Do I Know This Already?” quiz are found in Appendix A, “Answers to the ‘Do I Know This Already?’ Quizzes and Q&A Sections.” The suggested choices for your next step are as follows:
8 or less overall score—Read the entire chapter. This includes the “Foundation Topics” and “Foundation Summary” sections and the Q&A section.
9 or 10 overall score—If you want more review on these topics, skip to the “Foundation Summary” section and then go to the Q&A section. Otherwise, move to the next chapter.
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