Computer Networking
Parity bit is

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

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Computer Networking
What is a stub network?

A network with only one entry and no exit point.
A network that has only one entry and exit point.
A network with more than one exit and entry point.
A network with more than one exit point.

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Computer Networking
Communication network is

None of these
one or more conductors that serve as a common connection for a related group of devices
a continuous frequency capable of being modulated or impressed with a second signal
the condition with two or more stations attempt to use the same channel at the same time
a collection of interconnected functional units that provides a data communications service among stations attached to the network

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