Computer Networking
The main difference between synchronous and asynchronous transmission is

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

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Computer Networking
A front-end processor is

preliminary processor of batch jobs.
a user computer system
a minicomputer that relieves main-frame computers at a computer centre of communications control functions
None of these
a processor in a large-scale computer that executes operating system instructions

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