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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Computer Networking
RS-232-G

is an interface standard between Data terminal Equipment and Data Circuit Terminating Equipment
requires only 7 pin out of 25 in order to transmit digital data over public telephone lines
specifies only the mechanical characteristics of an interface by providing a 25-pin connector
is an interface between two data circuit terminating equipment as examplified by a local and remote modem
None of these

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