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.
You didn
NVRAM is corrupted.

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Computer Networking
The fundamental requirements of private-to-public network interconnection methods which need to be provided in gateways is/are

None of these
universal accessibility for private network Data Terminal Equipment (DTE)
to assign address to private network DTEs
adequate cost control mechanisms for administration of the private networks
A and B both

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Computer Networking
What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?

Sends back a message to the originating station asking for a name resolution
Drops the frame
Floods the network with the frame looking for the device
Forwards the switch to the first available link

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