Computer Networking
In session layer, during data transfer, the data stream responsible for the "control" purpose (i.e control of the session layer itself) is

Capability Data
Regular Data
Expedited Data
Typed data

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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
a set of physical layer standards developed by EIA and intended to replace RS-232-
None of these
a check bit appended to an array of binary digits to make the sum of the all the binary digits
the ratio of the number of data units in error to the total number of data units

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Computer Networking
The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver

None of these
cannot talk at once
can send or receive data one at a time
can receive and send data simultaneously
can do one way data transmission only

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