Computer Networking
A WATS arrangement

is never 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 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

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Computer Networking
Which of the following technique is used for encapsulation?

a technique used by protocols in which a lower level protocol accepts a message from a higher level protocol and places it in the data portion of the low level frame.
a technique used in best-effort delivery systems to avoid endlessly looping packets.
All of these
None of these
One of the pieces that results when an IP gateway divides an IP datagram into smaller pieces for transmission across a network that cannot handle the original datagram size

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