Question

If no frames are free, _____ page transfer(s) is/are required.

a) one
b) two
c) three
d) four

Answer 1

If no frames are free, two page transfers are required.

Step-by-step explanation:

If no frames are free, two page transfers are required.

When a computer system runs out of free frames in its memory, it needs to transfer pages from the main memory (RAM) to the secondary storage (like a hard disk) to create space for new pages. This process is known as page swapping or page swapping out.

For example, if a computer has a total of 4 frames and all of them are occupied, when a new page needs to be loaded into the memory, one of the existing pages needs to be swapped out (transferred to the secondary storage) to make room for the new page. This requires two page transfers - one to swap out the old page and another to swap in the new page.