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

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

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Computer Networking
Synchronous protocols

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

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