Computer Networking
MAC is

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

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

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