Computer Networking
X.21 is

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

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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?

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

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Computer Networking
You copy a configuration from a network host to a router's RAM. The configuration looks correct, yet it is not working at all. What could the problem be?

The IOS became corrupted after the copy command was initiated.
The copy did not override the shutdown command in running-config.
You copied the wrong configuration into RAM.
You copied the configuration into flash memory instead.

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