Computer Networking
RS-449/442-A/423-A is

None of these
a check bit appended to an array of binary digits to make the sum of the all the binary digits
the ratio of the number of data units in error to the total number of data units
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and
a set of physical layer standards developed by EIA and intended to replace RS-232-

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Computer Networking
What is split horizon?

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

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