Computer Networking
HDLC (High-level Data Link Control) is

a method access control technique for multiple-access transmission media
a very common bit-oriented data link protocol issued by ISO.
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
None of these

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Computer Networking
You type the following command into the router and receive the following output:Router#show serial 0/0 ^% Invalid input detected at '^' marker.Why was this error message displayed?

You need to be in privileged mode.
You cannot have a space between serial and 0/0.
Part of the command is missing.
The router does not have a serial0/0 interface.

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