The L2 network access tier devices forward the security class information for the different networks or sub networks to the network layer IDP devices, such as {HEAD ~ layer three routers} that incorporate {TAIL ~ security services} 
The L2 network access tier devices forward the security class information for the different networks or sub networks to the network layer IDP devices , such as { HEAD ~ layer three routers } that incorporate { TAIL ~ security services }
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL