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CCNA ICND2 200-101: Troubleshooting IPv4 Routing, Part II


  1. "Do I Know This Already?" Quiz
  2. Foundation Topics
  3. Exam Preparation Tasks

Chapter Description

This chapter digs into diagnosing and solving network problems as part of the objectives for the ICND2 200-101 exam.

Exam Preparation Tasks

Review All the Key Topics

Review the most important topics from this chapter, noted with the Key Topic icon. Table 5-4 lists these key topics and where each is discussed.


Table 5-4. Key Topics for Chapter 5

Key Topic Element


Page Number


Two root causes of DNS problems.


The rules for configuring ROAS.


Items to verify for switch trunking configuration to match a router’s ROAS configuration.


Conditions that must be true for DHCP messages to be able to flow from a client to a DHCP server.

Table 5-1

Common reasons why router LAN interfaces are not up/up.


When more than one route matches a packet’s destination address, the router uses the “best” (most specific) route.


Types of overlapping IP address configuration issues that IOS can and cannot recognize.

Complete the Tables and Lists from Memory

Print a copy of DVD Appendix D, “Memory Tables,” or at least the section for this chapter, and complete the tables and lists from memory. DVD Appendix E, “Memory Tables Answer Key,” includes completed tables and lists to check your work.

Definitions of Key Terms

After your first reading of the chapter, try to define these key terms, but do not be concerned about getting them all correct at that time. Chapter 22 directs you in how to use these terms for late-stage preparation for the exam.

forward route

reverse route