Question

Which technique is used that identifies the highest priority resource by means of software ?
A. Daisy chaining
B. Polling
C. Priority
D. Chaining

Answer 1

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B. Polling

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Answer 2

Answer:

A polling strategy is performed, which uses software to identify the highest priority resource.

Explanation:

• The process of a computer or controlling device waiting for an external device to check its readiness or status, which is typically done with low-level hardware, is known as polling.
• When a printer is connected to a computer through a parallel port, for example, the computer waits for the next character to be sent to the printer.

• When interrupts are unavailable, polling is typically used to identify I/O device events that require attention. On a regular basis, the CPU monitors each device for such occurrences. The drawback is the additional overhead associated with polling.

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