Q:
         
         
            
               What are demand-paging and pre-paging?
            
                      
         
             Answer
                        With demand paging, a page is brought into memory only when a location on that page is actually referenced during execution. With pre-paging, pages other than the one demanded by a page fault are brought in. The selection of such pages is done based on common access patterns, especially for secondary memory devices.
          
         
         
         
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