Computer Networking
Carrier is

the condition when two or more sections 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
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

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Computer Networking
The main difference between synchronous and asynchronous transmission is

the clocking is mixed with the data in asynchronous transmission
the bandwidth required is different
None of these
the pulse height is different.
the clocking is derived from the data in synchronous transmission

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