Backing up IOS software: Which IOS command copies the router's current IOS image from flash memory to a backup TFTP server on the network?

Introduction / Context:
Backing up the IOS image is part of disaster recovery. The IOS is stored in flash memory and can be transferred to a TFTP server for safekeeping before upgrades or hardware changes.

Given Data / Assumptions:

• You want to save the IOS image from flash.
• A TFTP server is reachable on the network.
• Router has IP connectivity to the TFTP server.

Concept / Approach:
The command 'copy flash tftp' prompts for the source filename (IOS image) and destination IP address, then transfers the file via TFTP. 'copy run start' saves the configuration only, not IOS. 'copy start tftp' saves startup-config to TFTP, not IOS.

Step-by-Step Solution:

Verification / Alternative check:
On the TFTP server, verify the IOS binary appears and file size matches the flash image.

Why Other Options Are Wrong:
transfer IOS to ...: Not a valid IOS command. copy run start / copy start tftp: Deal with configs, not IOS. copy flash tftp: Correct.

Common Pitfalls:
Ensure TFTP server is reachable and allows write permissions. Also verify sufficient storage space on the server.

Final Answer:
copy flash tftp