The DPE may be comprised of hardware or software elements and have associated with it {HEAD ~ a mechanism} for applying a rule or {TAIL ~ a set} of rules to packets either transmitted or received at the lowest layer at which the packets exist 
for applying
The DPE may be comprised of hardware or software elements and have associated with it { HEAD ~ a mechanism } for applying a rule or { TAIL ~ a set } of rules to packets either transmitted or received at the lowest layer at which the packets exist
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH