Discussion
Which command loads a new version of the Cisco IOS into a router?
Answer: D
Correct answer: copy tftp flash
Loading a new image reverses the previous command: the source is the TFTP server and the destination is flash. The router will ask whether to erase flash first, which matters because a router with too little free flash cannot hold both images - and if the erase is accepted and the transfer then fails, the router is left with no IOS and must be recovered from ROM monitor.
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