Computer Networking
Modulation is the process of

converting analog signals to digital signals
converting digital signals to analog signals
Multiplexing various signals into high speed line signals
performing data encryption.

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Computer Networking
The main difference between synchronous and asynchronous transmission is

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

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