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ISRO | ISRO CS 2020 | Question 49

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  • Last Updated : 04 Sep, 2020
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The operating system and the other processes are protected from being modified by an already running process because
(A) they run at different time instants and not in parallel
(B) they are in different logical addresses
(C) they use a protection algorithm in the scheduler
(D) every address generated by the CPU is being checked against the relocation and limit parameters

Answer: (D)

Explanation: Relocation registers used to protect user processes from each other, and from changing operating-system code and data.

  • Base register contains value of smallest physical address
  • Limit register contains range of logical addresses – each logical address must be less than the limit register.
  • MMU maps logical address dynamically.

Option (D) is correct.

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