As shown in the figure, which illustrates the negotiation process of IPsec, which of the following descriptions are correct? (Multiple Choice)

As shown in the figure, which illustrates the negotiation process of IPsec, which of the following descriptions are correct? (Multiple Choice)

A . This process is the IKEv2 negotiation process.
B. The red box part is the EAP authentication process.
C. ①② means that the two parties negotiate the data flow to be protected and the IPsec security proposal.
D. The red box is a mandatory negotiation process

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Answer: AB