A.network-based application recognition （NBAR）
B.authentication proxy
C.stateful packet filtering
D.AAA services
E.proxy server
F.IPS

A.The IP inspection rule can be applied in the inbound direction on the secured interface.
B.The IP inspection rule can be applied in the outbound direction on the unsecured interface.
C.The ACL applied in the outbound direction on the unsecured interface should be an extended ACL.
D.The ACL applied in the inbound direction on the unsecured interface should be an extended ACL.
E.For temporary openings to be created dynamically by Cisco IOS Firewall，the access-list for thereturning traffic must be a standard ACL.
F.For temporary openings to be created dynamically by Cisco IOS Firewall，the IP inspection rule must be applied to the secured interface.