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Time taken in memory access through PTBR is :

  • A.extended by a factor of 3
  • B.extended by a factor of 2
  • C.slowed by a factor of 3
  • D.slowed by a factor of 2

Answer: D

Correct answer: slowed by a factor of 2

With the table in memory, each reference needs two accesses: one to read the page table entry and one to reach the datum. The effective access time is therefore doubled, which is precisely why the TLB exists.

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