The IOS User Interface
The Cisco Internetwork Operating System (IOS) is the kernel of Cisco routers and most switches. In case you didn't know, a kernel is the basic, indispensable part of an operating system that allocates resources and manages things such as low-level hardware interfaces and security.
In the following sections, I'll show you the Cisco IOS and how to configure a Cisco router using the command-line interface (CLI).
I'm going to save Cisco switch configurations for Chapter 7, “Layer 2 Switching.”
Cisco Router IOS
The Cisco IOS is a proprietary kernel that provides routing, switching, internetworking, and telecommunications features. ...
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