wherein applying the set of {HEAD ~ attack patterns comprises} applying {TAIL ~ a first set} of patterns defined by a first policy to the first portion of the network traffic to detect the first set of corresponding network attacks and applying a second set of patterns defined by a second policy to the second portion of the network traffic to detect the second set of corresponding network attacks, the first set of patterns and the second set of patterns differing by at least one pattern, and 
applying
wherein applying the set of { HEAD ~ attack patterns comprises } applying { TAIL ~ a first set } of patterns defined by a first policy to the first portion of the network traffic to detect the first set of corresponding network attacks and applying a second set of patterns defined by a second policy to the second portion of the network traffic to detect the second set of corresponding network attacks , the first set of patterns and the second set of patterns differing by at least one pattern , and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH