| Overview

A Cisco router cannot operate without the Cisco Internetworking Operating System (IOS). Each Cisco router has a predetermined boot-up sequence for locating and loading the IOS. This module will describe the stages and importance of this boot up procedure. Cisco internetworking devices operate using several different files, including Cisco Internetwork Operating System (IOS) images and configuration files. A network administrator who wishes to keep the network running smoothly and reliably must carefully manage these files to ensure that the proper versions are used and that necessary backups are performed. This module also describes the Cisco file system and provides the tools to manage it effectively. Students completing this module should be able to: Identify the stages of the router boot sequence Determine how a Cisco device locates and loads the Cisco IOS Use the boot system command Identify the configuration register values Briefly describe the files used by the Cisco IOS and their functions List the locations on the router of the different file types Briefly describe the parts of the IOS name Save and restore configuration files using TFTP and copy-and-paste Load an IOS image using TFTP Load an IOS image using XModem Verify the file system using show commands