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

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

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Computer Networking
Synchronous protocols

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

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