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

Which attribute is required for all IKE phase 2 negotiations？（）

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

单项选择题

Two VPN peers are negotiating IKE phase 1 using main mode. Which message pair in the negotiation contains the phase 1 proposal for the peers？（）

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

单项选择题

Which operational mode command displays all active IPsec phase 2 security associations？（）

A.show ike security-associations
B.show ipsec security-associations
C.show security ike security-associations
D.show security ipsec security-associations