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 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.

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Computer Networking
Error rate is

the ratio of the number of data units in error to the total number of data units
a check bit appended to an array of binary digits to make the sum of all the binary digits.
None of these
an error-detecting code based on a summation operation performed on the bits to be checked.
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

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Computer Networking
The physical layer, in reference to the OSI model, defines

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

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