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GIAC GSEC Exam - Topic 5 Question 76 Discussion

Actual exam question for GIAC's GSEC exam
Question #: 76
Topic #: 5
[All GSEC Questions]

You are reviewing a packet capture file from your network intrusion detection system. In the packet stream, you come across a long series of "no operation" (NOP) commands. In addition to the NOP commands, there appears to be a malicious payload. Of the following, which is the most appropriate preventative measure for this type of attack?

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Suggested Answer: C

by Isabelle at Nov 22, 2025, 05:37 AM

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Dorcas
10 hours ago
Surprised to see NOPs in a packet capture, that's a red flag!
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Dorothy
6 days ago
I think D might help too, but not sure.
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Queenie
11 days ago
Definitely B, boundary checks are key!
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Tiara
16 days ago
NOPs are often used in buffer overflow attacks.
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Chanel
21 days ago
Haha, imagine trying to stop a NOP attack with file permissions. That's like using a spoon to dig a hole. B) is the way to go, no doubt.
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Alease
26 days ago
A) Limits on the number of failed logins? Nah, that's not gonna cut it. This is a job for some good old-fashioned boundary checks, baby!
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Pete
1 month ago
D) Restrictions on file permissions? Really? That's like putting a band-aid on a bullet wound. B) is clearly the right choice here.
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Rex
1 month ago
I keep mixing up the different types of attacks, but I don't think file permissions would help with NOP sleds. It has to be something more specific to input handling.
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Germaine
1 month ago
I'm not entirely sure, but I feel like failed login limits wouldn't really apply here since this seems more about exploiting memory.
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Marshall
2 months ago
I remember studying about buffer overflow attacks, and NOPs are often used in those scenarios. I think it might relate to boundary checks on inputs.
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Crista
2 months ago
Whoa, this is a tricky one. I'm leaning towards B, but I'm not 100% confident. Guess I'll have to think it through carefully on the exam.
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Von
2 months ago
Ugh, buffer overflows are the worst. I'm going to go with B, boundary checks, to stop that malicious payload from running. Seems like the best option to me.
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Lauran
2 months ago
Hmm, I'd say C) Controls against time of check/time of use attacks. Sounds like the best way to stop that NOP nonsense.
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Jerry
2 months ago
Okay, I think I got this. The NOP commands are setting up a buffer overflow, so B is the right answer here. Gotta watch out for those input validation issues.
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Yasuko
2 months ago
B) Boundary checks on program inputs is the way to go. Gotta keep those nasty payloads out!
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Brittney
3 months ago
I like B too. It directly addresses the exploit method used.
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Martha
3 months ago
I practiced a question similar to this, and I think the right answer is about input validation. So, maybe option B?
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Elza
3 months ago
Hmm, I'm not sure about this one. The NOP sled is throwing me off. Maybe C - controls against time of check/time of use attacks could work?
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Margart
3 months ago
This looks like a buffer overflow attack. I'd go with B - boundary checks on program inputs to prevent the malicious payload from executing.
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