Computer Networking
Contention is

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

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Computer Networking
Synchronous protocols

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

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