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To back up an IOS, what command will you use?

  • A.backup IOS disk
  • B.copy ios tftp
  • C.copy tftp flash
  • D.copy flash tftp

Answer: D

Correct answer: copy flash tftp

The IOS image lives in flash, and a backup copies it from there to a TFTP server, so the source comes first and the destination second: copy flash tftp. Reversing it, copy tftp flash, is the command for an upgrade, which writes a new image into flash from the server. Reading the two words in order is the whole of the distinction, and it is the same convention as copy running-config startup-config.

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