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
Multiplexers use Time Division Multiplexing (TDM) while statistical multiplexers use Frequency Division Multiplexing (FDM)
None of these

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Computer Networking
What is the purpose of Spanning Tree Protocol in a switched LAN?

To create collision domains
To manage the VLAN database across multiple switches
To prevent routing loops in networks with redundant paths
To provide a mechanism for network monitoring in switched environments
To prevent switching loops in networks with redundant switched paths

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