Computer Networking
Carrier is

the condition when two or more sections attempt to use the same channel at the same time
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
a collection of interconnected functional units that provides a data communications service among stations attached to the network
None of these

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Computer Networking
Bulletin board system

None of these
is a public access message system
converts analog signals to digital signals
converts digital signals to analog signals
is a modem capable of accepting commands

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