Computer Networking
A WATS arrangement

None of these
is always less expensive than flat-rate service
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
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
What is the purpose of flow control?

To reassemble segments in the correct order at the destination device.
To ensure that data is retransmitted if an acknowledgment is not received.
To provide a means for the receiver to govern the amount of data sent by the sender.
To regulate the size of each segment.

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