This software enables network services in Cisco products, including carrying the
chosen network protocols and functions, and adding interfaces and capability as needed for
network growth.
4 Chapter 1: Review of Cisco IOS for Routers and Switches
This chapter is designed as a review of prerequisite knowledge. It is a review of the Cisco IOS
command-line interface (CLI) structure and the Cisco IOS commands used to create a basic router
and switch con?¬?guration. You will use these commands in an introductory lab that will serve as
the initial con?¬?guration for all the subsequent lab activities.
Cisco IOS CLI Functions
Cisco IOS Software uses a CLI as its traditional console environment to enter commands. This
section reviews the functions of the Cisco IOS CLI.
Although Cisco IOS Software is a core technology that extends across many products, its
operation details vary depending on the internetworking devices that are involved. To enter
commands into the CLI, type or paste the entries within one of the several console con?¬?guration
modes. In terminal con?¬?guration mode, each con?¬?guration command entered is parsed as soon as
you press the Enter key.
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