Which data communication method is used to transmit the data over a serial…
2017
Which data communication method is used to transmit the data over a serial communication link in both directions at the same time?
Answer: C. Full-duplex — ConceptA communication mode is classified by the direction of data flow and by whether both endpoints may transmit simultaneously. The three standard modes…
- A.
Simplex
- B.
Half-duplex
- C.
Full-duplex
- D.
Four-wire circuit
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Correct answer: C
Concept
A communication mode is classified by the direction of data flow and by whether both endpoints may transmit simultaneously.
The three standard modes are one-way flow, alternating two-way flow, and simultaneous two-way flow.
Application
The stem requires both endpoints of the serial link to transmit at the same time. That requirement is the definition of full-duplex communication.
Contrast
Simplex supports data flow in only one direction.
Half-duplex supports both directions, but the endpoints transmit one at a time.
A four-wire circuit is a physical wiring arrangement, not the name of a communication direction mode.
Cross-check
A telephone conversation illustrates the requirement: both participants can speak and hear concurrently, which corresponds to simultaneous two-way transmission.
Result
Therefore, the required data communication method is full-duplex.
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