Question

The copy-back protocol is used ________

(a) To copy the contents of the memory onto the cache

(b) To update the contents of the memory from the cache

(c) To remove the contents of the cache and push it on to the memory

(d) None of the mentioned

I have been asked this question during an interview.

My question is based upon Caches topic in chapter Memory System of Computer Architecture

Answer 1

The correct choice is (b) To update the contents of the memory from the cache

To explain: This is another way of performing the write operation, wherein the cache is updated first and then the memory.