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You save the configuration on a router with the copy running-config startup-config command and reboot the router. The router, however, comes up with a blank configuration. What can the problem be?

You didn't boot the router with the correct command.
NVRAM is corrupted.
The configuration register setting is incorrect.
The newly upgraded IOS is not compatible with the hardware of the router.

Correct Answer: The configuration register setting is incorrect.

Explanation:

If you save a configuration and reload the router and it comes up either in setup mode or as a blank configuration, chances are you have the configuration register setting incorrect.

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