The examples in this book use "Router" as the router 's name. That's fine for examples, but a bad idea in real life. Eventually, a router should be given a name. To set the router name to "Sphinx", use the hostname command:
Router(config)#hostname Sphinx Sphinx(config)#
The router instantly responds by updating the prompt to reflect the new router name. The name can be up to 254 characters long, but don't use a name so long that you can't type it comfortably.
It's a good practice to follow a naming convention for your routers. With a logical, consistent naming scheme, it's easy to remember a router's name, or guess the name if you've forgotten it. For example, let's say that your router names all start with "rtr", followed by the city initials, followed by a number. Then, late one night when you're staring at a blank terminal screen trying to remember the name of the backbone router in New York, you can type rtr-ny-01 and be reasonably confident that you've guessed correctly.
IOS Images and Configuration Files
Basic Router Configuration
IP Routing Topics
Interior Routing Protocols
Border Gateway Protocol
Quality of Service
Specialized Networking Topics
Switches and VLANs
Troubleshooting and Logging
Appendix A Network Basics