A.If the initiator knows the responder's policy, or has a comprehensive understanding of the responder's policy, aggressive mode can create an IKE SA faster.

B.Compared with main mode, the advantage of aggressive mode is that it can establish IKE SA faster.

C.During remote access, if the responder (server) cannot know the address of the initiator (end user) in advance, or the initiator's address is always changing, and both parties want to use the pre-shared key verification method to create an IKE SA , you can use the main mode at this time

D.Since key exchange occurs together with identity authentication, aggressive mode cannot provide identity protection.

A.Local application

B.Online application

C.Offline application

D.Apply online