A remote batch-processing operation in which data is solely input to a central…
2013
A remote batch-processing operation in which data is solely input to a central computer would require
Answer: B. simplex lines — ConceptTransmission mode classifies a communication link by the permitted direction and timing of data flow. It is independent of the physical medium or…
- A.
telegraph line
- B.
simplex lines
- C.
mixed band channel
- D.
all of the above
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Show answer & explanation
Correct answer: B
Concept
Transmission mode classifies a communication link by the permitted direction and timing of data flow. It is independent of the physical medium or signalling service used by the link.
Transmission mode | Direction and timing |
|---|---|
Simplex | One endpoint always sends; the other endpoint always receives. |
Half-duplex | Either endpoint may send, but the endpoints do not send simultaneously. |
Full-duplex | Both endpoints may send simultaneously. |
Application
Identify the data path: the remote terminal supplies a batch of records to the central computer.
Read the qualifier “solely input”: during the described operation, data travels from the remote terminal to the central computer, and no reverse transfer is required.
Match the direction to the definition: fixed one-way flow corresponds to simplex transmission.
Cross-check and contrast
A telegraph line names a communication service or physical line; the phrase alone does not specify a direction-of-flow mode.
“Mixed band channel” is not one of the standard simplex, half-duplex, or full-duplex direction-of-flow modes.
“All of the above” would require every listed choice to establish the required one-way mode, which the medium and band descriptions do not do.
Result
Therefore, the remote input-only operation requires simplex lines.