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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]

Which exchange lakes care of DoS protection in IKEv2?

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:

Oren
7 days ago
I agree with Annamae, IKE_SA_INIT makes sense for DoS protection.
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Audria
7 days ago
I'm not sure, but I think it might be C) IKE_Auth for DoS protection.
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Sage
12 days ago
D) Create_CHILD_SA? Really? That's like trying to put out a fire with gasoline. Not a chance.
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Tiffiny
14 days ago
C) IKE_Auth seems like the logical choice here. I mean, who doesn't love a good authentication phase, am I right?
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Lucina
15 days ago
B) IKE_SA_INIT, of course! That's where the magic happens to protect against DoS attacks. Can't believe anyone would think otherwise.
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Eugene
3 days ago
User 1: I think it's IKE_SA_INIT too, it's crucial for DoS protection.
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Annamae
18 days ago
I think the answer is B) IKE_SA_INIT.
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