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| 4.2 |  | End-System Commands for Gathering Data Link Information |
| 4.2.5 |  | Cisco IOS show commands |

There is a wealth of information that can be gathered from Layer 2 Cisco IOS show commands. The two main challenges troubleshooters face when using show commands are: choosing the right command to obtain the desired information, and correctly interpreting the command output. Pertinent show commands and descriptions are listed in Figure .