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

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

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Computer Networking
Contention is

the condition when two or more stations attempt to use the same channel at the same time
None of these
a continuous frequency capable of being modulated or impressed with a second signal
One or more conductors that serve as a common connection for a related group of devices
a collection of interconnected functional units that provides a data communications service among stations attached to the network

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