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Fortinet Exam NSE7_NST-7.2 Topic 3 Question 17 Discussion

Actual exam question for Fortinet's NSE7_NST-7.2 exam
Question #: 17
Topic #: 3
[All NSE7_NST-7.2 Questions]

There are four exchanges during IKEv2 negotiation.

Which sequence is correct?

Show Suggested Answer Hide Answer
Suggested Answer: B

IKE_SA_INIT Exchange:

The IKE_SA_INIT exchange is the first step in the IKEv2 negotiation process. It is responsible for setting up the initial security association (SA) and performing Diffie-Hellman key exchange.

During this exchange, the responder may employ various measures to protect against Denial of Service (DoS) attacks, such as rate limiting and the use of puzzles to increase the computational cost for an attacker.

DoS Protection Mechanisms:

One key method involves limiting the number of half-open SAs from any single IP address or subnet.

The IKE_SA_INIT exchange can also incorporate the use of stateless cookies, which help to verify the initiator's legitimacy without requiring extensive resource allocation by the responder until the initiator is verified.


RFC 5996: Internet Key Exchange Protocol Version 2 (IKEv2) (RFC Editor).

RFC 8019: Protecting Internet Key Exchange Protocol Version 2 (IKEv2) Implementations from Distributed Denial-of-Service Attacks (IETF Datatracker).

Contribute your Thoughts:

Whitley
1 months ago
I bet the exam writer was having a bit too much fun with these answer options. 'SET_Nonce'? Really? Definitely going with B on this one.
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Paola
12 days ago
Yeah, B does seem like the most logical sequence out of the choices given.
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Caitlin
16 days ago
I'm leaning towards B as well. It seems to make the most sense out of all the options.
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Terrilyn
18 days ago
I agree, these answer options are quite interesting. I think B is the correct sequence.
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Reynalda
1 months ago
Option D has 'IKE_SAJNIT' which doesn't look right. I'm confident that B is the correct sequence for the IKEv2 negotiation process.
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Nicolette
18 days ago
I'm confident that B is the correct sequence for the IKEv2 negotiation process.
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Arlette
1 months ago
Option D has 'IKE_SAJNIT' which doesn't look right.
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Fernanda
2 months ago
Haha, 'PiggyBack_CHILD'? That's a new one! I think I'll go with B, it sounds the most like the IKEv2 exchange I've learned about.
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Earlean
10 days ago
User4: Yeah, B seems like the right choice.
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Octavio
17 days ago
User3: I think B is the correct sequence.
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Virgilio
17 days ago
User 3: Virgilio: Yeah, B does seem like the correct sequence for IKEv2 negotiation.
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Coleen
23 days ago
User 2: Coleen: I think I'll go with B, it sounds the most like the IKEv2 exchange I've learned about.
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Charlesetta
29 days ago
User2: I agree, it does sound interesting.
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Daniel
1 months ago
User1: Haha, 'PiggyBack_CHILD'? That's a new one!
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Laura
1 months ago
User 1: Haha, 'PiggyBack_CHILD'? That's a new one!
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Pamella
2 months ago
Hmm, I'm a bit unsure about this one. The options seem to mix up some of the IKEv2 message names. I'm leaning towards B, but I'll double-check my notes just to be sure.
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Adelle
2 months ago
I'm pretty sure the correct sequence is B. The question specifically mentions IKEv2 negotiation, and the options in B match the expected flow.
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Madelyn
2 months ago
I'm not sure, but I think C) INIT_Re, INIT_Auth, ID_Child and SET_Nonce could also be a possible sequence based on my understanding.
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Toshia
3 months ago
I agree with Leota, the sequence B) makes sense because it follows the standard IKEv2 negotiation process.
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Leota
3 months ago
I think the correct sequence is B) lnit_Req, Wait_lnit_Req, ID_Auth_Req and Create_CHILD_SA.
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