Chapter 3. A crash course on Cisco’s Internetwork Operating System

If you’re used to using a graphical user interface (GUI) for system administration, administering a Cisco network will take some getting used to. Although Cisco has made a modest effort at point-and-click configuration utilities, the command-line interface (CLI) has always been available. It’s powerful, efficient, and mostly unambiguous. When you type configuration commands into a switch or router, you’re generally going to have a pretty good idea about what that command will do. Unlike a GUI, which hides a lot of things behind colorful buttons and user-friendly messages, the CLI is black and white.

If you’re not used to using the command line on other platforms like Windows or ...

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