WhichthreefeaturesarebenefitsofusingGREtunnelsinconjunctionwithIPsecforbuildingsite－to－siteVPNs?()A.allowsdynamicroutingoverthetunnelB.supportsmulti-protocol（non-IP）trafficoverthetunnelC.reducesIPsecheadersoverheadsincetunnelmodeisusedD.simplifiestheACLus
题目
WhichthreefeaturesarebenefitsofusingGREtunnelsinconjunctionwithIPsecforbuildingsite－to－siteVPNs?()
A.allowsdynamicroutingoverthetunnel
B.supportsmulti-protocol（non-IP）trafficoverthetunnel
C.reducesIPsecheadersoverheadsincetunnelmodeisused
D.simplifiestheACLusedinthecryptomap
E.usesVirtualTunnelInterface（VTI）tosimplifytheIPsecVPNconfiguration