Computer Networking
A WATS arrangement

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

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Computer Networking
The main difference between TCP and UDP is

All of these
TCP is an Internet protocol where as UDP is an ATM protocol
UDP is a datagram where as TCP is a connection oriented service
UDP is connection oriented where as TCP is datagram service
None of these

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