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Todd Lammle's CCNA/CCENT IOS Commands Survival Guide: Exams 100-101, 200-101, and 200-120 by Todd Lammle

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Chapter 1

Basic IOS Commands

This book starts by introducing you to the Cisco Internetwork Operating System (IOS). The IOS is what runs Cisco routers as well as some Cisco switches, and it’s what allows you to configure the devices. You use the command-line interface (CLI) to configure a router, and that is what I’ll show you in this chapter.

The Cisco router IOS software is responsible for the following important tasks:

  • Carrying network protocols and functions
  • Connecting high-speed traffic between devices
  • Adding security to control access and stop unauthorized network use
  • Providing scalability for ease of network growth and redundancy
  • Supplying network reliability for connecting to network resources

You can access the Cisco IOS through the ...

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