Computer Networking
MAC is

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

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Computer Networking
Parity bit is

a check bit appended to an array of binary digits to make the sum of all the binary digits.
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.
the ratio of the number of data units in error to the total number of data units

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