A TFTP server can help manage the storage of IOS images and revisions to IOS images. For any network, it is good practice to keep a backup copy of the Cisco IOS Software image in case the system image in the router becomes corrupted or accidentally erased. A TFTP server can also be used to store new upgrades to the IOS and then deployed throughout the network where it is needed. In this activity, you will upgrade the IOS images on Cisco devices by using a TFTP server. You will also backup an IOS image with the use of a TFTP server.
Packet Tracer - Using a TFTP Server to Upgrade a Cisco IOS Image Instructions
Packet Tracer - Using a TFTP Server to Upgrade a Cisco IOS Image - PKA