Independence Day Deal! Unlock 25% OFF Today – Limited-Time Offer - Ends In 00:00:00 Coupon code: SAVE25
Welcome to Pass4Success

- Free Preparation Discussions

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?

Show Suggested Answer Hide Answer
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.


Contribute your Thoughts:

Alpha
2 months ago
Because both TCP and UDP ports can be queried for DNS zone transfer.
upvoted 0 times
...
Melissa
3 months 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.
upvoted 0 times
Marti
19 days ago
Always good to consider all options.
upvoted 0 times
...
Daniel
20 days ago
True, 'None of the above' can be a safe bet.
upvoted 0 times
...
Josephine
24 days ago
I agree, but D is also a valid choice.
upvoted 0 times
...
Rolland
25 days ago
I think C is the correct answer.
upvoted 0 times
...
Myra
29 days ago
Always good to consider all options.
upvoted 0 times
...
Dustin
1 months ago
True, 'None of the above' can be a safe bet.
upvoted 0 times
...
Yuki
2 months ago
I agree, but D is also a valid choice.
upvoted 0 times
...
Joseph
2 months ago
I think C is the correct answer.
upvoted 0 times
...
...
Kristofer
3 months ago
Why do you think it's C)?
upvoted 0 times
...
Alpha
3 months ago
I disagree, I believe the answer is C) Both 1 and 2.
upvoted 0 times
...
Eura
3 months 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.
upvoted 0 times
Jose
2 months ago
C) Both 1 and 2
upvoted 0 times
...
Hildred
2 months ago
B) 53/UDP
upvoted 0 times
...
Denae
2 months ago
A) 53/TCP
upvoted 0 times
...
...
Kristofer
3 months ago
I think the answer is A) 53/TCP.
upvoted 0 times
...
Edelmira
3 months ago
D? Really? That can't be right. Why would there be an option for 'None of the above' on a DNS question?
upvoted 0 times
...
Pamela
3 months ago
Hmm, I thought zone transfers only used TCP. Guess I need to brush up on my DNS knowledge.
upvoted 0 times
Tuyet
2 months ago
User 3: I guess we both need to review our DNS knowledge.
upvoted 0 times
...
Cecily
2 months ago
User 2: Yeah, me too. But apparently it can also use UDP.
upvoted 0 times
...
Ivette
2 months ago
User 1: I always thought DNS zone transfers only used TCP.
upvoted 0 times
...
...
Cherelle
3 months ago
Obviously, it's C. Both TCP and UDP port 53 are used for DNS queries, including zone transfers.
upvoted 0 times
Christiane
3 months ago
So, the correct answer is C. Both 53/TCP and 53/UDP can be used for DNS zone transfers.
upvoted 0 times
...
Adolph
3 months ago
Yes, you're right. Port 53 can be queried for DNS zone transfers.
upvoted 0 times
...
Tran
3 months ago
I think it's C. Both TCP and UDP port 53 are used for DNS queries.
upvoted 0 times
...
...

Save Cancel
az-700  pass4success  az-104  200-301  200-201  cissp  350-401  350-201  350-501  350-601  350-801  350-901  az-720  az-305  pl-300  

Warning: Cannot modify header information - headers already sent by (output started at /pass.php:70) in /pass.php on line 77