James Boney, Cisco IOS in a Nutshell: A Desktop Quick Reference for IOS on IP Networks
ISBN: 156592942X | edition 2001 | PDF | 606 pages | 4 mb
Routers are the glue that holds the Internet together, and Cisco Systems–holding roughly 70% of the market–is the most prominent router manufacturer. Cisco's routers come in all shapes and sizes and almost all of them, from the smallest to the largest, run the IOS operating system. IOS is an extremely powerful and complex operating system, with an equally complex configuration language. There are many commands, with many options, and if one thing is configured incorrectly, the entire company could find itself offline.