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 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.
It holds the regular updates from broadcasting to a downed link.

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

network access standard for connecting stations to a circuit-switched network
None of these
a method access control technique for multiple-access transmission media
a very common bit-oriented data link protocol issued by ISO.
a method of determining which device has access to the transmission medium at any time

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