Computer Networking
Which of the following best illustrates the default subnet mask for a class A,B, and C Network?

None of these
255.255.0.0, 255.255.255.0, 255.255.255.255
0.0.0.0, 0.0.0.1, 0.0.1.1
255.0.0.0, 255.255.0.0, 255.255.255.0
255.255.255.0, 255.255.0.0, 255.0.0.0

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Computer Networking
What is split horizon?

It holds the regular updates from broadcasting to a downed link.
Information about a route should not be sent back in the direction from which the original update came.
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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