Computer Networking
A distributed data processing configuration in which all activities must pass through a centrally located computer is called a:

ring network
data control network
hierarchical network
None of these
spider network

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Computer Networking
Modulation is the process of

performing data encryption.
converting digital signals to analog signals
converting analog signals to digital signals
Multiplexing various signals into high speed line signals

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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."

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

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