Computer Networking
Communication network is

a continuous frequency capable of being modulated or impressed with a second signal
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
None of these
the condition with two or more stations attempt to use the same channel at the same time

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Computer Networking
An encyclopedic database

is an information utility that specializes in storing and searching information
All of these
is easy for beginners to use
is generally free
None of these

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