Computer Networking
TCP is:

Connection orientated and unreliable
Operates at the Data Link layer
None of these
Connection orientated and reliable
Connectionless and unreliable

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Computer Networking
A WATS arrangement

None of these
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long
is always less expensive than flat-rate service
is less expensive than flat-rate service only when the number of calls is large and the duration of each is short
is never less expensive than flat-rate service

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Computer Networking
Demodulation is a process of

multiplexing various signals into one high speed line signals
performing data description.
converting analog to digital signals
converting digital to analog signals

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