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 14-question quiz, derived from the major sections in the "Foundation Topics" portion of the chapter, helps you to determine how to spend your limited study time.

Table 9-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

Table 9-1 "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

Foundation Topics Section

Questions Covered in This Section

Score

MPLS Components

1-3

MPLS Labels

4-5

Label Switching Routers

6-7

Label Allocation in Frame Mode MPLS Networks

8-10

Label Distribution

11-14

Total Score

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 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 is the underlying architectural component of MPLS that deals with maintaining routing information and label exchange?

b. LFIB

c. Control plane d. Data plane

2. Which of the following is the underlying architectural component of MPLS that deals with traffic forwarding based on destination address or label?

b. LFIB

c. Control plane d. Data plane

3. Which of the following MPLS architectural components would deal with protocols such as OSPF and RSVP?

a. Control plane b. Data plane c. LIB

d. MPLS TE

4. MPLS labels are associated with which of the following to more efficiently forward packets?

b. FECN

5. In number of bits, how long is an MPLS label?

6. An MPLS node that is capable of performing a label lookup and replacement is known as which of the following?

7. Which of the following is a device that adds or removes labels in the course of its normal operation?

b. Edge LSR

8. Which MPLS table exists in the control plane and provides the database of label information learned from neighbors?

b. LFIB

d. FLIB

9. Which of the following is populated from the IGP routing table and used in forwarding labeled packets?

c. LFIB

10. Which of the following is used in forwarding unlabeled packets?

c. LFIB

11. MPLS architecture allows for two ways of propagating label information. Which are they?

a. Extension of existing protocol functionality b. Static routes c. Creation of new protocols designed for label exchange d. Reconfiguration of network devices to manually input label information

12. The decision to assign a label to a particular FEC is made by which of the following?

13. When no label exists on a packet traversing the network and individual LSRs find that they must forward the packet based solely on FIB lookup, this is known as which of the following?

a. Interim packet propagation b. Packet propagation c. Penultimate hop popping d. Label allocation

14. When a path exists between a particular source and destination and all LSRs in the path have label entries for that source and destination, a tunnel is created known as which of the following?

c. MPLS-LDP

d. MPLS-TE

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:

■ 9 or fewer overall score—Read the entire chapter. This includes the "Foundation Topics," "Foundation Summary," and "Q&A" sections.

■ 10 or 11 overall score—Begin with the "Foundation Summary" section, and then go to the "Q&A" section.

■ 12 or more 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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