Computer Networking
What is split horizon?

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.
It prevents regular update messages from reinstating a route that has gone down.
It splits the traffic when you have a large bus (horizon) physical network.

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Computer Networking
Demodulation is the process of

converting analog signals to digital signals
combining many low speed channels into one high speed channel
converting digital signals to analog signals
None of these
dividing the high-speed signals into frequency bands

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