In general, techniques are described for hierarchical application of {HEAD ~ security services} with {TAIL ~ a network device} 
In general , techniques are described for hierarchical application of { HEAD ~ security services } with { TAIL ~ a network device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL