Cisco Routers for the Desperate, 2nd Edition

Chapter 2. Router Configuration

Now that you're logged in and have a basic understanding of how to enter commands, let's set up the router. The show version command explains some basic facts about your router, such as the software version, hardware type, and supported interfaces. Because the output is quite long, I won't include it all here, but we'll look at a few important snippets.

router# show version
Cisco Internetwork Operating System Software
IOS (tm)  3600 Software (C3640-IS56I-M),  Version 12.0(7)XK1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) ...