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542 Chapter 8: Call Admission Control and QoS Signaling

“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 “Foundation Topics” section of the chapter, helps you determine how to spend your limited study time.

Table 8-1 outlines the major topics discussed in this chapter and the “Do I Know This Already?” quiz questions that correspond to those topics.

Table 8-1 “Do I Know This Already?” Foundation Topics Section-to-Question Mapping


Foundation Topics Section Covering These












Call Admission Control Concepts

1 to 3







Local-Based CAC

4 to 6







Measurement-Based CAC

7 to 9







Resource-Based CAC

10 to 14






All questions


1 to 14






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, mark this question wrong for purposes of the self-assessment. Giving yourself credit for an answer you correctly guess skews your self-assessment results and might provide you with a false sense of security.

You can find the answers to the “Do I Know This Already?” quiz 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:

12 or less overall score—Read the entire chapter. This includes the “Foundation Topics,” “Foundation Summary,” and “Q&A” sections.

13 or 14 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.

“Do I Know This Already?” Quiz 543

1Why is call admission control needed in an environment where LLQ has been properly implemented?

2How does a channel-associated signaling circuit, such as E&M or T1 CAS, react to call admission control?

3Name four possible measures that a CAC mechanism can take in the event that the resources are not available to proceed with the call.

4What is the definition of local-based CAC?

5What Cisco IOS command is used to enable CAC on a VoFR network?

6What Cisco IOS command is used to enable physical DS0 limitation?

7What is the definition of measurement-based CAC?

8What is the difference between an SAA packet and a ping packet?

9What Cisco IOS command is used to allow the destination node to participate in measurement-based CAC?

10What is the definition of resource-based CAC?

11For a gatekeeper to provide CAC, what must be configured for each link that requires protection?

12What is IntServ and how does it work?

13Name the messages used by RSVP to provide resource reservation and CAC.

14What level of service must be in place to provide CAC?