I'm pretty sure A and D are the right answers, but who comes up with these strange IPsec acronyms anyway? IKE, Diffie Hellman, what is this, a secret agent convention?
B is a trick answer, XAuth is a separate authentication mechanism, not part of the IKE negotiation modes. I hope the real exam doesn't have as many distractors as this practice question!
C is definitely wrong, that's not how the packet exchange works in either mode. Gotta love these tricky networking questions, always keeping you on your toes!
A and D are correct. Main mode is more secure but takes longer, while aggressive mode is faster but less secure. I still can't believe we need to remember all these IPsec details for the exam!
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