Computer Networking
Which of the followings is used in communications is referred to as unshielded twisted-pair (UTP)?

Fiber-optic cable
Coaxial cable
Twisted-pair cable
None of these

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Computer Networking
What is split horizon?

It splits the traffic when you have a large bus (horizon) physical network.
It prevents regular update messages from reinstating a route that has gone down.
Information about a route should not be sent back in the direction from which the original update came.
It holds the regular updates from broadcasting to a downed link.

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Computer Networking
The network layer, in reference to the OSI model, provide

All of these
the virtual circuit interface to packet-switched service
the interface between the X.25 network and packet mode device
None of these
data link procedures that provide for the exchange of data via frames that can be sent and received

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