Computer Networking
The MAC (Media Access Control) address of the network card is used in both Ethernet and Token-Ring networks and is essential for communication. What does MAC provide?

The logical domain address for the workstation
A logical address that identifies the workstation
A physical address that is assigned by the manufacturer
An alias for the computer name
A physical address that is randomly assigned each time the computer is started

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Computer Networking
Error detecting code is

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

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Computer Networking
RS-449/442-A/423-A is

None of these
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
a set of physical layer standards developed by EIA and intended to replace RS-232-
a check bit appended to an array of binary digits to make the sum of the all the binary digits

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