Computer Networking
Synchronous protocols

None of these
allow faster transmission than asynchronous protocols do
are more reliable
are generally used by personal computers
transmit characters one at a time

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Computer Networking
The difference between a multiplexer and a statistical multiplexer is

Multiplexers use Time Division Multiplexing (TDM) while statistical multiplexers use Frequency Division Multiplexing (FDM)
Multiplexer use X.25 protocol, while statistical multiplexers use the Aloha protocol
Multiplexers often waste the output link capacity while statistical multiplexers optimize its use
None of these
Statistical multiplexers need buffers while multiplexers do not need buffers

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