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GIAC GISP Exam - Topic 1 Question 90 Discussion

You work as a Network Administrator for NetTech Inc. The company's network has a Windows 2000 domain-based network. You want to prevent malicious e-mails from entering the network from the non-existing domains. What will you do to accomplish this?
C) Enable DNS reverse lookup on the e-mail server.
A) Enable DNS recursive queries on the DNS server.
B) Disable DNS reverse lookup on the e-mail server.
D) Disable DNS recursive queries on the DNS server.

GIAC GISP Exam - Topic 1 Question 90 Discussion

Actual exam question for GIAC's GISP exam
Question #: 90
Topic #: 1
[All GISP Questions]

You work as a Network Administrator for NetTech Inc. The company's network has a Windows 2000 domain-based network. You want to prevent malicious e-mails from entering the network from the non-existing domains. What will you do to accomplish this?

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Suggested Answer: C

by Vallie at Jul 22, 2026, 04:11 AM

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Nan
4 days ago
I think disabling DNS recursive queries is the way to go.
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Chu
9 days ago
I’m leaning towards option D, but I’m not confident. I remember something about recursive queries being a security risk in some scenarios.
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Chaya
14 days ago
I feel like I might have seen something about disabling DNS reverse lookup causing issues with email delivery, but I can't recall the details.
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Keshia
19 days ago
I remember a practice question where enabling DNS reverse lookup was mentioned as a way to verify email sources. Could that be relevant here?
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Deandrea
25 days ago
I think disabling DNS recursive queries might help, but I'm not entirely sure if that's the right approach for blocking malicious emails.
upvoted 0 times
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