Computer Networking
The main difference between synchronous and asynchronous transmission is

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

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Computer Networking
Bulletin board system

is a public access message system
converts analog signals to digital signals
None of these
is a modem capable of accepting commands
converts digital signals to analog signals

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