Computer Networking
What is the problem with an interface if you type show interface serial 0 and receive the following message? "Serial0 is administratively down, line protocol is down."

No cable is attached.
The keepalives are different times.
The administrator has the interface shut down.
The administrator is pinging from the interface.

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

Statistical multiplexers need buffers while multiplexers do not need buffers
Multiplexers often waste the output link capacity while statistical multiplexers optimize its use
None of these
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)

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Computer Networking
What does a VLAN do?

Breaks up broadcast domains in a layer 2 switch internetwork.
Acts as the fastest port to all servers.
Provides multiple broadcast domains within a single collision domain.
Provides multiple collision domains on one switch port.

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