CCNA 5.4 Backing up and restoring Cisco IOS

• Cisco IOS can be back up & restored through TFTP, Cisco IFS & SDM
• Before upgrading IOS, user have to verify router flash memory space through show flash or show version command
• Copy flash tftp command is used to backup Cisco IOS to a TFTP server
• Copy tftp flash command is used to restore or upgrade Cisco IOS from a TFTP server
• Cisco IOS File System (IFS) allows user to work with files and directories through Windows DOS prompt