In {HEAD ~ the query process} , the respective index tables and the identifier table are used to query whether the target identifier is present in {TAIL ~ the cache memory} at a step  
In { HEAD ~ the query process } , the respective index tables and the identifier table are used to query whether the target identifier is present in { TAIL ~ the cache memory } at a step
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH