Several Command Line Interface (CLI) commands can be used to troubleshoot Layer 1 issues on Cisco IOS Catalyst switches. Commonly used commands include the show interfaces, the show controllers, and the show interface [name] counters errors commands. In addition to knowing these commands, you also are required to be able to interpret accurately the output or information that these commands provide.
The show interfaces command is a powerful troubleshooting tool that provides a plethora of information, which includes the following:
- The administrative status of a switching port
- The port operational state
- The media type . . .
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