Computer Networking
A distributed network configuration in which all data/information pass through a central computer is

bus network
None of these
star network
ring network
Point-to-point network

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

a method access control technique for multiple-access transmission media
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
None of these
a very common bit-oriented data link protocol issued by ISO.

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

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