Computer Networking
The network layer, in reference to the OSI model, provide

All of these
the interface between the X.25 network and packet mode device
data link procedures that provide for the exchange of data via frames that can be sent and received
None of these
the virtual circuit interface to packet-switched service

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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)
Statistical multiplexers need buffers while multiplexers do not need buffers
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
None of these

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