CCNA Routing and Switching Portable Command Guide, Third Edition

Chapter 25. Basic Troubleshooting

This chapter provides information and commands concerning the following topics:

▪ Viewing the routing table

▪ Clearing the routing table

▪ Determining the gateway of last resort

▪ Determining the last routing update

▪ OSI Layer 3 testing

▪ OSI Layer 7 testing

▪ Interpreting the show interface command

▪ Clearing interface counters

▪ Using CDP to troubleshoot

▪ The traceroute command

▪ The show controllers command

▪ debug commands

▪ Using time stamps

▪ Operating system IP verification commands

▪ The ip http server command

▪ The netstat command

▪ The arp command

Viewing the Routing Table

Clearing the Routing Table ...