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Which unit protects the hardware?

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Which unit protects the hardware?

(a) MMU

(b) hardware unit

(c) bus interface unit

(d) execution unit

The question was asked during an interview.

Question is taken from Resource Protection topic in portion Real Time Operating systems of Embedded Systems

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Right answer is (a) MMU

Explanation: The hardware part is protected by the memory management unit. The memory part is also protected by the memory management unit. The hardware such as the input-output devices are protected and is prevented from the direct access.

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