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
the ratio of the number of data units in error to the total number of data units
a set of physical layer standards developed by EIA and intended to replace RS-232-
None of these

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Computer Networking
The fundamental requirements of private-to-public network interconnection methods which need to be provided in gateways is/are

adequate cost control mechanisms for administration of the private networks
to assign address to private network DTEs
A and B both
universal accessibility for private network Data Terminal Equipment (DTE)
None of these

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