This is a fairly easy question but if you’re a newbie in Cisco routers, then this can be a handy guide to tell you the details.

To see the version of IOS, there is one command which give a detailed overview of the software installed on the system (Cisco router or switch).Lets issue the command:

Certhacker#show version

The following sample information will be shown:

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Hostname is the name of the router. It’s up to us what we name it. It’s like giving a name to our own systems. If we are using a command line interface to access the router or switch, then we can see the current name of the device before the prompt.

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