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

a check bit appended to an array of binary digits to make the sum of the 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
a set of physical layer standards developed by EIA and intended to replace RS-232-
the ratio of the number of data units in error to the total number of data units

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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?

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

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