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?

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

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Computer Networking
The physical layer, in reference to the OSI model, defines

the interface between the X.25 network and packet mode device
the virtual circuit interface to packet-switched service
None of these
All of these
data link procedures that provide for the exchange of data via frames that can be sent and received

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