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hello everyone and welcome back in the previous session we talked about cachet design and there we talked a little bit about various cache replacement policies however we didnt go into the details of those so as promised from this session onwards we will be discussing about various cache replacement policies starting with random replacement first in first out last in first out and finally the optimal cache replacement policy so without any further ado lets get to learning now in the previous session during our discussion of cache design we came across the block replacement phase basically its required when the cache suffers from either capacity or conflict miss in any of these two scenarios we evict one block from the cache and make space for the newly requested block now during this phase we came across a very vital question which was which block to replace now for direct mapping if we observe closely suppose these are the main memory blocks and these are the cache lines basically