Cache replacement policies are necessary: to determine which cache mapping policy to use to determine which block in cache should be the victim block to decide where to put blocks when cache is empty all of the above The early computer networking protocol that provided nearly instantaneous access between client terminals and host computers was: OSI SNA TCP/IP DARPAnet The ISO/OSI layer that organizes message bytes into frames of suitable size for transmission along the physical medium is the _______ layer. data link network transport session The ISO/OSI layer responsible for routing PDUs across intermediate nodes is the ______ layer. data link network transport session