Computer Networking
Terminals are required for

None of these
realtime, timesharing, and distributed processing
realtime, batch processing, and timesharing
realtime, distributed processing, and manager inquiry
realtime, timesharing, and message switching

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Computer Networking
RS-449/442-A/423-A 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
a check bit appended to an array of binary digits to make the sum of the all the binary digits
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
MAC is

a very common bit-oriented data link protocol issued to ISO.
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

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