TAILIEUCHUNG - CCNA 1 and 2 Companion Guide, Revised (Cisco Networking Academy Program) part 85

Cisco Networking Academy Program CCNA 1 and 2 Companion Guide, Revised part 85 is the Cisco approved textbook to use alongside version of the Cisco Networking Academy Program CCNA 1 and CCNA 2 web-based courses. The topics covered provide you with the necessary knowledge to begin your preparation for the CCNA certification exam (640-801, or 640-821 and 640-811) and to enter the field of network administration. | Page 809 Tuesday May 27 2003 2 19 PM Summary 809 The no debug all command and undebug all command turn off all diagnostic output. To disable a particular debug command use the no form of the command. For example if debug for monitoring RIP was enabled with the command debug ip rip it can be disabled with no debug ip rip. To view what is currently being examined by a debug command use show debugging. Lab Activity Troubleshooting Routing Issues with debug In this lab you use a systematic OSI troubleshooting process and various show commands to gather information to diagnose routing problems. You then use various debug commands to assist in troubleshooting. Summary In this chapter you learned the following Network testing should be utilized to keep a network running smoothly and efficiently. It should be tested layer by layer. You should use a structured approach to troubleshooting. ping and telnet are two commands that are helpful in troubleshooting network problems. The traceroute command can be used to determine the status of links between routers The different show commands help to confirm Layer 1 and Layer 2 problems. The show ip route and show ip protocol commands help to identify routing issues. Basic debug commands help to discover information about router activity. To supplement all that you ve learned in this chapter refer to the chapter-specific Videos PhotoZooms and e-Lab Activities on the CD-ROM accompanying this book. Page 810 Tuesday May 20 2003 2 53 PM 810 Chapter 18 Basic Router Troubleshooting Key Terms keepalive Message sent by one network device to inform another network device that the virtual circuit between the two is still active. network interface card NIC Board that provides network communication capabilities to and from a computer system. ping Packet Internet groper. ICMP echo message and its reply. Used in IP networks to test the reachability of a network device. Telnet Standard terminal-emulation protocol in the TCP IP

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