Computer Networking
A WATS arrangement

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
is always less expensive than flat-rate service

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Computer Networking
The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver

can receive and send data simultaneously
can do one way data transmission only
cannot talk at once
None of these
can send or receive data one at a time

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Computer Networking
What is a stub network?

A network with only one entry and no exit point.
A network that has only one entry and exit point.
A network with more than one exit and entry point.
A network with more than one exit point.

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