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
is never 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
None of these
is always less expensive than flat-rate service

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Computer Networking
Demodulation is a process of

multiplexing various signals into one high speed line signals
converting analog to digital signals
converting digital to analog signals
performing data description.

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Computer Networking
ARP (Address Resolution Protocol) is

a protocol that handles error and control messages
a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address
a protocol used to monitor computers
None of these
a TCP/IP high level protocol for transferring files from one machine to another

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