Computer Networking
Communication network is

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

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Computer Networking
Error rate is

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.
the ratio of the number of data units in error to the total number of data units

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Computer Networking
MAC is

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

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