Outline

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Module 9: Basic Router Troubleshooting

Module Overview

9.1

Examining the Routing Table

9.1.1	The show ip route Command
9.1.2	Determining the gateway of last resort
9.1.3	Determining route source and destination
9.1.4	Determining L2 and L3 addresses
9.1.5	Determining the route administrative distance
9.1.6	Determining the route metric
9.1.7	Determining the route next hop
9.1.8	Determining the last routing update
9.1.9	Observing multiple paths to destination

9.2

Network Testing

9.2.1	Introduction to network testing
9.2.2	Using a structured approach to troubleshooting
9.2.3	Testing by OSI layers
9.2.4	Layer 1 troubleshooting using indicators
9.2.5	Layer 3 troubleshooting using ping
9.2.6	Layer 7 troubleshooting using Telnet

9.3

Troubleshooting Router Issues Overview

9.3.1	Troubleshooting Layer 1 using show interface
9.3.2	Troubleshooting Layer 2 using show interface
9.3.3	Troubleshooting using show cdp
9.3.4	Troubleshooting using traceroute
9.3.5	Troubleshooting routing issues
9.3.6	Troubleshooting using show controllers serial
9.3.7	Introduction to debug

Module Summary

Module Quiz



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