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How many modes are used to isolate the kernel and the other components of the operating system?

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How many modes are used to isolate the kernel and the other components of the operating system?

(a) 2

(b) 3

(c) 4

(d) 5

This question was addressed to me in final exam.

This intriguing question comes from Resource Protection-II in section Real Time Operating systems of Embedded Systems

1 Answer

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Right answer is (a) 2

To explain: There are two modes that are used for isolating the kernel and the other components of the operating system from any process and user applications that are running. These are kernel mode and the user mode.

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