Computer Networking
If digital data rate of 9600 bps is encoded using 8-level phase shift keying (PSK) method, the modulation rate is

1200 bands
9600 bands
None of these
4800 bands
3200 bands

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Computer Networking
Terminals are required for

None of these
realtime, timesharing, and message switching
realtime, batch processing, and timesharing
realtime, distributed processing, and manager inquiry
realtime, timesharing, and distributed processing

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Computer Networking
A WATS arrangement

is never less expensive than flat-rate service
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
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long

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