Computer Networking
HDLC (High-level Data Link Control) is

a method access control technique for multiple-access transmission media
a very common bit-oriented data link protocol issued by ISO.
None of these
a method of determining which device has access to the transmission medium at any time
network access standard for connecting stations to a circuit-switched network

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

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

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