Scenarios

6 Mar

The following scenario and questions are designed to draw together the content of the chapter and to exercise your understanding of the concepts. There is not necessarily a right answer. The thought process and practice in manipulating the concepts is the goal of this section. The answers to the scenario questions are found at the end of this chapter.

Scenario 1-1
Scenario 1-1 provides you with the data produced with the Cisco router IOS command show ip route . A legend defining the fields of the sample output is also provided to assist in answering the questions for Scenario 1-1.

Example 1-2 contains sample output from the show ip route command.

Example 1-2 The show ip route Command Output
Scenarios

The following information defines the fields reported in the show ip route command:

■ The first column lists the protocol that derived the route.

■ The second column might list certain protocol-specific information as defined in the display header.

■ The third column lists the address of the remote network. The first number in the brackets is the administrative distance of the information source; the second number is the metric for the route.

■ The fourth column specifies the address of the router that can build a route to the specified remote network.

■ The fifth column specifies the last time that the route was updated, in hours:minutes:seconds.

■ The final column specifies the interface through which the specified network can be reached.

Answer the following questions by using the output from the preceding show ip route command.

1. What routing protocol derived the route 130.130.0.0?

2. What router interface IP address is used to reach IP network 192.67.131.0?

3. When was the last time that the route 192.65.129.0 was updated?

4. Through which router interface can the IP network 128.128.0.0 be reached?

Scenario Answers

The answers provided in this section are not necessarily the only possible answers to the questions. The questions are designed to test your knowledge and to give practical exercise in certain key areas. This section is intended to test and exercise skills and concepts detailed in the body of this chapter.

If your answer is different, ask yourself whether it follows the tenets explained in the answers provided. Your answer is correct not if it matches the solution provided in the book, but rather if it has included the principles of design laid out in the chapter.

In this way, the testing provided in these scenarios is deeper: It examines not only your knowledge, but also your understanding and ability to apply that knowledge to problems.

If you do not get the correct answer, refer back to the text and review the subject tested. Be certain also to review your notes on the question to ensure that you understand the principles of the subject.

Scenario 1-1 Answers

1. What routing protocol derived the route 130.130.0.0?
OSPF.

2. What router interface IP address is used to reach IP network 192.67.131.0?

131.119.254.244. The fourth column of the sample output specifies the address of the router that can build a route to the specified remote network.

3. When was the last time that the route 192.65.129.0 was updated?

0:02:22. The fifth column of the sample output specifies the last time the route was updated, in hours:minutes:seconds.

4. Through which router interface can the IP network 128.128.0.0 be reached?

Ethernet2. The last column in the sample output specifies the interface through which the specified network can be reached.

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