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

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

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Computer Networking
A T-switch is used to

control how messages are passed between computers
echo every character that is received
transmit characters one at a time
None of these
rearrange the connections between computing equipment

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Computer Networking
Terminals are required for

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

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