Computer Networking
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?

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

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Computer Networking
MAC is

a method of determining which device has access to the transmission medium at any time
a very common bit-oriented data link protocol issued to ISO.
network access standard for connecting stations to a circuit-switched network
a method access control technique or multiple-access transmission media
None of these

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