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