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F5 Networks 201 Exam - Topic 3 Question 119 Discussion

DNS queries from two internal DNS servers are being load balanced to external DNS Servers via a VirtualServer on a BIG-P device. The DNS queries originate from 192.168.101.100 and 192.168.101.200 andtarget 192.168.21.50All DNS queries destined for the external DNS Servers failWhich property change should the BIG-IP Administrator make in the Virtual Server to resolve this issue?
C) Protocol to UDP
A) Protocol Profile (Client) to DNS-OPTIMZED
B) Type to Performance (HTTP)
D) Source Address to 192.168.101.0/24

F5 Networks 201 Exam - Topic 3 Question 119 Discussion

Actual exam question for F5 Networks's 201 exam
Question #: 119
Topic #: 3
[All 201 Questions]

DNS queries from two internal DNS servers are being load balanced to external DNS Servers via a Virtual

Server on a BIG-P device. The DNS queries originate from 192.168.101.100 and 192.168.101.200 and

target 192.168.21.50

All DNS queries destined for the external DNS Servers fail

Which property change should the BIG-IP Administrator make in the Virtual Server to resolve this issue?

Show Suggested Answer Hide Answer
Suggested Answer: C

by Arlen at Nov 25, 2025, 04:39 PM

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Deeann
1 month ago
I’m leaning towards D. Source address could be a factor too.
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Bernardine
2 months ago
A might help, but I still think C is more direct.
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Daron
2 months ago
But what about A? DNS-OPTIMIZED could help too.
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In
2 months ago
Agreed! DNS uses UDP, so changing the protocol makes sense.
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Melissa
2 months ago
I feel like C is the right choice. UDP is essential for DNS.
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Carole
2 months ago
This question is tricky. I think it’s about the protocol.
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Kara
2 months ago
Why would we need to change the type to HTTP? That seems off.
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Becky
3 months ago
I’d go with option A for optimization.
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Edelmira
3 months ago
Wait, are we sure the source address needs to change?
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Page
3 months ago
Definitely agree, DNS uses UDP by default!
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Mollie
4 months ago
I think changing the Protocol to UDP makes sense.
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Dorothy
4 months ago
Haha, who would choose B) Type to Performance (HTTP) for a DNS issue? That's just silly.
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Jesus
4 months ago
This question is a piece of cake! C) Protocol to UDP is the way to go.
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Nikita
4 months ago
D) Source Address to 192.168.101.0/24 is an interesting choice, but it doesn't seem to address the issue directly.
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Tamekia
4 months ago
A) Protocol Profile (Client) to DNS-OPTIMZED sounds like a good option to optimize DNS traffic.
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Lucy
4 months ago
I think the right answer might be to set the Protocol to UDP since DNS typically uses that, but I could be wrong.
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Karol
5 months ago
I’m a bit confused about whether changing the Source Address would actually help. Wouldn’t that just affect routing?
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Arminda
5 months ago
This question feels familiar; I think we practiced a similar one where we had to adjust the protocol settings for DNS traffic.
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Colene
5 months ago
I remember something about DNS queries needing to use UDP, but I'm not entirely sure if that's the only thing we need to change here.
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Raul
5 months ago
I'm not sure about this one. There are a few different options that could potentially fix the issue. I think I'll need to review the BIG-IP configuration and DNS troubleshooting steps to determine the best approach.
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Crista
5 months ago
I'm pretty confident that the answer is A) Protocol Profile (Client) to DNS-OPTIMZED. The question states that the DNS queries are being load balanced, so we likely need to optimize the protocol profile for DNS traffic on the Virtual Server.
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Barrett
6 months ago
Hmm, this seems tricky. I'm leaning towards D) Source Address to 192.168.101.0/24. Since the queries are originating from two specific IP addresses, we might need to update the source address on the Virtual Server to match that range.
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Tegan
6 months ago
C) Protocol to UDP is the correct answer. DNS uses UDP for standard queries.
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Jacklyn
6 months ago
I'm a bit confused on this one. The question mentions a Virtual Server on a BIG-IP device, so I'm not sure if the protocol change is the right approach. Maybe we need to look at the Virtual Server configuration more closely.
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Ocie
7 months ago
I think the answer is C) Protocol to UDP. The question mentions that the DNS queries are failing, so the protocol needs to be changed to UDP since DNS typically uses UDP.
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Gabriele
1 month ago
Good catch! Let's go with C.
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Samira
1 month ago
UDP is essential for DNS queries.
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Daniel
5 months ago
C seems like the right choice.
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Christiane
6 months ago
Definitely, DNS relies on UDP.
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Estrella
6 months ago
I agree, changing to UDP makes sense.
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