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The SecOps Group Exam CNSP Topic 6 Question 5 Discussion

Actual exam question for The SecOps Group's CNSP exam
Question #: 5
Topic #: 6
[All CNSP Questions]

What ports can be queried to perform a DNS zone transfer?

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Suggested Answer: A

A DNS zone transfer involves replicating the DNS zone data (e.g., all records for a domain) from a primary to a secondary DNS server, requiring a reliable transport mechanism.

Why A is correct: DNS zone transfers use TCP port 53 because TCP ensures reliable, ordered delivery of data, which is critical for transferring large zone files. CNSP notes that TCP is the standard protocol for zone transfers (e.g., AXFR requests), as specified in RFC 5936.

Why other options are incorrect:

B . 53/UDP: UDP port 53 is used for standard DNS queries and responses due to its speed and lower overhead, but it is not suitable for zone transfers, which require reliability over speed.

C . Both 1 and 2: This is incorrect because zone transfers are exclusively TCP-based, not UDP-based.

D . None of the above: Incorrect, as 53/TCP is the correct port for DNS zone transfers.


by Raul at Mar 23, 2025, 03:27 PM

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Alpha
8 days ago
Because both TCP and UDP ports can be queried for DNS zone transfer.
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Melissa
12 days ago
C is the correct answer, but I'm also partial to D. 'None of the above' is always a valid choice, especially on trick questions like this.
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Kristofer
13 days ago
Why do you think it's C)?
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Alpha
15 days ago
I disagree, I believe the answer is C) Both 1 and 2.
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Eura
19 days ago
Haha, the exam writer must have a twisted sense of humor to include such a silly option. C is the way to go, no doubt about it.
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Kristofer
24 days ago
I think the answer is A) 53/TCP.
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Edelmira
25 days ago
D? Really? That can't be right. Why would there be an option for 'None of the above' on a DNS question?
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Pamela
26 days ago
Hmm, I thought zone transfers only used TCP. Guess I need to brush up on my DNS knowledge.
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Cherelle
28 days ago
Obviously, it's C. Both TCP and UDP port 53 are used for DNS queries, including zone transfers.
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Christiane
12 days ago
So, the correct answer is C. Both 53/TCP and 53/UDP can be used for DNS zone transfers.
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Adolph
14 days ago
Yes, you're right. Port 53 can be queried for DNS zone transfers.
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Tran
17 days ago
I think it's C. Both TCP and UDP port 53 are used for DNS queries.
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