Computer Networking
A communications device that combines transmissions from several I/O devices into one line is a:

full-duplex line
modifier
concentrator
multiplexer
None of these

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Computer Networking
Bus is

a continuous frequency capable of being modulated or impressed with a second signal
one or more conductors that some as a common connection for a related group of devices
the condition when two or more stations attempt to use the same channel at the same time
None of these
a collection of interconnected functional units that provides a data communications service among stations attached to the network

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Computer Networking
Synchronous protocols

are more reliable
None of these
allow faster transmission than asynchronous protocols do
transmit characters one at a time
are generally used by personal computers

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