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