Cisco CCNA 2 Instructor Manual page 111

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:
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Use and understand the output of the show ip route command
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Determine the gateway of last resort
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Determine the route source and destination address
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Determine the route administrative distance
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Determine the route metric
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Determine the route next hop
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Determine the last route update
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Observe multiple paths to a destination
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Use a structured approach to troubleshooting
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Test by OSI layers
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Use indicators to troubleshoot Layer 1
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Use the ping command to troubleshoot Layer 3
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Use the telnet command to troubleshoot Layer 7
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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:
110 - 238 CCNA 2: Routers and Routing Basics v3.1 Instructor Guide – Module 9
show cdp
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traceroute
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show controllers serial
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debug
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