Computer Networking
X.21 is

a method access control technique for multiple-access transmission media
a very common bit-oriented data link protocol issued by 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

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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?

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

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