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

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

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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?

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

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