Cisco Systems CCNA 2 manual Module 9 Summary, Show cdp Traceroute Show controllers serial Debug

Module 9 Summary

Before students begin Module 10, they must be able to read and interpret a routing table and must have mastered a range of IOS commands for troubleshooting.

Online assessment options include the end-of-module online quiz in the curriculum and the online Module 9 exam. Paper activities and hands-on router challenges should be used to give students troubleshooting practice. Consider giving students previously-bugged configuration files so they can demonstrate their troubleshooting skills in a timed, controlled setting.

Students should understand the following main points:

•Use and understand the output of the show ip route command

•Determine the gateway of last resort

•Determine the route source and destination address

•Determine the route administrative distance

•Determine the route metric

•Determine the route next hop

•Determine the last route update

•Observe multiple paths to a destination

•Use a structured approach to troubleshooting

•Test by OSI layers

•Use indicators to troubleshoot Layer 1

•Use the ping command to troubleshoot Layer 3

•Use the telnet command to troubleshoot Layer 7

•Use the show interfaces command to troubleshoot Layer 1 and Layer 2

•Use the show ip route and show ip protocols commands to troubleshoot routing issues

•Use the following commands to troubleshoot various router problems:

–show cdp

–

–

–

traceroute

show controllers serial

debug

110 - 238 CCNA 2: Routers and Routing Basics v3.1 Instructor Guide – Module 9 Copyright ♥ 2004, Cisco Systems, Inc.