31 Days Before Your CCNA Exam

Day 15Managing Cisco IOS andConfiguration FilesCCNA 640-802 Exam Topics■Manage IOS configuration files (save, edit, upgrade, restore).■■Manage Cisco IOS.Verify router hardware and software operation using SHOW & DEBUG commands.Key TopicsIOS images and configurations files can become corrupted through intentional attacks, unintentionaluser errors, and device failure. To prevent these problems, you have to be able to save, back up,and restore configuration and IOS images. Today we review file management operations.The Cisco IOS File SystemCisco IOS devices provide a feature called the Cisco IOS Integrated File System (IFS). Thissystem allows you to create, navigate, and manipulate directories on a Cisco device. The directoriesavailable depend on the platform.IFS CommandsExample 15-1 shows output from the show file systems command.Example 15-1Default File System for an 1841 RouterRouter#show file systemsFile Systems:Size(b) Free(b) Type Flags Prefixes- - opaque rw archive:- - opaque rw system:- - opaque rw null:- - network rw tftp:196600 194101 nvram rw nvram:* 63995904 31092736 disk rw flash:#- - opaque wo syslog:- - opaque rw xmodem:- - opaque rw ymodem: