Computer Networking
The synchronous modems are more costly than the asynchronous modems because

they transmit the data with stop and start bits.
they operate with a larger bandwidth
they contain clock recovery circuits
None of these
they produce large volume of data

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Computer Networking
Bus is

a continuous frequency capable of being modulated or impressed with a second signal
one or more conductors that some 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
the condition when two or more stations attempt to use the same channel at the same time

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