Cisco Systems CCNA 2 manual Troubleshooting command line errors, Show version command

The syntax of IOS commands can be complex. The feature used to recall commands can help students save time when they program or troubleshoot a router.

2.2.9 Troubleshooting command line errors

This troubleshooting lab allows students to log into the router and access various modes. Demonstrate the use of the question mark (?) as a helpful tool for students who do not know which command to enter.

Also demonstrate the use of the history command as a helpful tool for students to troubleshoot problems without retyping repeated commands.

2.2.10The show version command

The show version command displays information about the Cisco IOS software version. This information includes the system image file name and the location from which it was booted. It also contains the configuration register and the boot-field setting. Explain that an important aspect of router and IOS maintenance is to know exactly which version of the IOS is being used.

Cisco has numerous major and minor IOS releases. There are many different versions and different features to meet the requirements of a network. Students should know that the show version command shows much more than just the version of the IOS. This is an important command. Explain to students is that this is the only command that can be used to examine the configuration register.

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