Computer Networking
A WATS arrangement

is always less expensive than flat-rate service
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long
None of these
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
TCP is:

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

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