Content

| Summary

In this module, it was explained that a network baseline is required for effective troubleshooting. Devices and key interfaces should be baselined to provide a reference for subsequent analysis. The thresholds for these devices and interfaces should be documented.

The need for network documentation consisting of a network configuration table and topology diagram was emphasized. The components of a network configuration table and topology diagram can be categorized by the logical layers that they are associated with in the TCP/IP model. Following established procedures, a troubleshooter can gather relevant configuration information about routers and switches. Performing the five stages in the process of creating network documentation allows a troubleshooter to create a network configuration table and topology diagram. Following guidelines makes it easy for a troubleshooter to create useful and effective network configuration documentation.

End-system documentation consists of a configuration table and end-to-end topology diagram. The components of an end-system configuration table and topology diagram can be split into physical and logical categories. Following established procedures, a troubleshooter can gather relevant configuration information about a variety of end-systems. There are several commands and applications available for discovering configuration information about end-systems. Good end-system configuration documentation allows rapid discovery of specific information about end-systems.

The next module will expand on internetwork troubleshooting with an exploration of troubleshooting methodologies and tools.