Computer Networking
Carrier is

a continuous frequency capable of being modulated or impressed with a second signal
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 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
The main difference between synchronous and asynchronous transmission is

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

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Computer Networking
X.21 is

network access standard for connecting stations to a circuit-switched network
None of these
a very common bit-oriented data link protocol issued by ISO
a method access control technique for multiple-access transmission media
a method of determining which device has access to the transmission medium at any time

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