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
Multiplexers use Time Division Multiplexing (TDM) while statistical multiplexers use Frequency Division Multiplexing (FDM)
Statistical multiplexers need buffers while multiplexers do not need buffers
Multiplexer use X.25 protocol, while statistical multiplexers use the Aloha protocol

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Computer Networking
If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?

Discard it and send an error message back to the originating host
Add the destination to the MAC address table and then forward the frame
Add the source address and port to the MAC address table and forward the frame out the destination port
Flood the network with the frame

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