Computer Networking
The synchronous modems are more costly than the asynchronous modems because

they operate with a larger bandwidth
they transmit the data with stop and start bits.
None of these
they contain clock recovery circuits
they produce large volume of data

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Computer Networking
Error detecting code is

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

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Computer Networking
What is split horizon?

It holds the regular updates from broadcasting to a downed link.
It prevents regular update messages from reinstating a route that has gone down.
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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