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CCDA Self-Study: RIP, IGRP, and EIGRP Characteristics and Design

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This sample chapter reviews distance-vector routing protocols, covers both versions of the Routing Information Protocol (RIP), and discusses the Cisco Interior Gateway Routing Protocol (IGRP) and Enhanced Interior Gateway Routing Protocol (EIGRP) — important knowledge for the CCDA.
This chapter is from the book

This chapter covers the following subjects:

  • RIPv1
  • RIPv2
  • IGRP

This chapter reviews distance-vector routing protocols. It covers both versions of the Routing Information Protocol (RIP). It also discusses the Cisco Interior Gateway Routing Protocol (IGRP) and Enhanced Interior Gateway Routing Protocol (EIGRP). The CCDA should understand the capabilities and constraints of each routing protocol.

"Do I Know This Already?" Quiz

The purpose of the "Do I Know This Already?" quiz is to help you decide whether you need to read the entire chapter. If you intend to read the entire chapter, you do not necessarily need to answer these questions now.

The 8-question quiz, derived from the major sections in the "Foundation Topics" portion of the chapter, helps you determine how to spend your limited study time.

Table 12-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?" quiz questions that correspond to those topics.

Table 12-1 "Do I Know This Already?" Foundation Topics Section-to-Question Mapping

Foundation Topics Section

Questions Covered in This Section


1, 2, 5


1, 3, 7




4, 6, 7, 8


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 you 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 you correctly guess skews your self-assessment results and might provide you with a false sense of security.

  1. Which protocol should you select if the network diameter is more than 17 hops?

    1. RIPv1

    2. RIPv2

    3. EIGRP

    4. Answers a and b

    5. Answers b and c

    6. Answers a, b, and c

  2. How often does a RIPv1 router broadcast its routing table by default?

    1. Every 30 seconds.

    2. Every 60 seconds.

    3. Every 90 seconds.

    4. RIPv1 does not broadcast periodically.

    1. RIPv2 improves RIPv1 with which of the following capabilities?

    2. Multicast updates, authentication, hop count

    3. Multicast updates, authentication, variable-length subnet mask (VLSM)

    4. Authentication, VLSM, hop count

    5. Multicast updates, hop count

  3. Which protocol maintains neighbor adjacencies?

    1. RIPv2 and EIGRP

    2. IGRP and EIGRP

    3. RIPv2

    4. EIGRP

  4. Which pair of routing protocols does not support VLSM or classless interdomain routing (CIDR)?

    1. EIGRP and IGRP

    2. RIPv1 and RIPv2

    3. RIPv1 and IGRP

    4. Intermediate System-to-Intermediate System (IS-IS) and Open Shortest Path First (OSPF)

  5. Which parameters does the computation of the EIGRP composite metric use by default?

    1. Bandwidth and load

    2. Bandwidth and delay

    3. Bandwidth and reliability

    4. Bandwidth and maximum transmission unit (MTU)

  6. Which protocols support VLSM?

    1. RIPv1 and RIPv2

    2. EIGRP and IGRP

    3. RIPv1 and IGRP

    4. RIPv2 and EIGRP

  7. Which routing protocol implements the diffusing update algorithm (DUAL)?

    1. IS-IS

    2. IGRP

    3. EIGRP

    4. OSPF

The answers to the "Do I Know This Already?" quiz appear in Appendix A, "Answers to Chapter 'Do I Know This Already?' Quizzes and Q&A sections." The suggested choices for your next step are as follows:

  • 6 or less overall score—Read the entire chapter. This includes the "Foundation Topics," "Foundation Summary," and "Q&A" sections.

  • 7–8 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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