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
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-
None of these
the ratio of the number of data units in error to the total number of data units

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Computer Networking
When setting up Frame Relay for point-to-point subinterfaces, which of the following must not be configured?

The Frame Relay encapsulation on the physical interface
The local DLCI on each subinterface
PAP
An IP address on the physical interface
The subinterface type as point-to-point

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Computer Networking
Synchronous protocols

allow faster transmission than asynchronous protocols do
are generally used by personal computers
are more reliable
None of these
transmit characters one at a time

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