单项选择题

Which attribute is optional for IKE phase 2 negotiations？（）

A.proxy-ID
B.phase 2 proposal
C.Diffie-Hellman group key
D.security protocol （ESP or AH）

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单项选择题WhichattributeisrequiredforallIKEphase2negotiations？（）

A.proxy-ID
B.preshared key
C.Diffie-Hellman group key
D.main or aggressive mode

单项选择题TwoVPNpeersarenegotiatingIKEphase1usingmainmode.Whichmessagepairinthenegotiation containsthephase1proposalforthepeers？（）

A.message 1 and 2
B.message 3 and 4
C.message 5 and 6
D.message 7 and 8