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F5 Networks 303 Exam - Topic 4 Question 20 Discussion

A web application requires knowledge of the client's true IP address for logging and analysis purposes. Instances of the application that can decode X-Forwarded-For HTTP headers reside in pool_a, while pool_b instances assume the source IP is the true address of the client.Which iRule provides the proper functionality?
C) when HTTP_REQUEST { if {[HTTP::header exists X-Forwarded-For]}{ pool pool_a } else { pool pool_b } }
A) when HTTP_DATA { if {[HTTP::header exists X-Forwarded-For]}{ pool pool_a } else { pool pool_b } }
B) when HTTP_RESPONSE { if {[HTTP::header exists X-Forwarded-For]}{ pool pool_a } else { pool pool_b } }
D) when HTTP_OPEN { if {[HTTP::header exists X-Forwarded-For]}{ pool pool_a } else { pool pool_b } }

F5 Networks 303 Exam - Topic 4 Question 20 Discussion

Actual exam question for F5 Networks's 303 exam
Question #: 20
Topic #: 4
[All 303 Questions]

A web application requires knowledge of the client's true IP address for logging and analysis purposes. Instances of the application that can decode X-Forwarded-For HTTP headers reside in pool_a, while pool_b instances assume the source IP is the true address of the client.

Which iRule provides the proper functionality?

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Suggested Answer: C

by Dannie at Aug 18, 2025, 02:31 AM

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Quentin
5 months ago
Wait, isn't B just wrong? It should be about requests, not responses.
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Marshall
6 months ago
I think A makes more sense, it's about the data.
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Nakisha
6 months ago
Definitely C, that's when the request is made.
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Jina
6 months ago
A is a solid choice, but I lean towards C too.
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Rebecka
6 months ago
I agree with C, but I’m surprised it’s not more obvious!
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Chun
6 months ago
I feel like HTTP_RESPONSE wouldn't be correct because we need the IP before the response is sent, right? So, maybe it's C?
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Tish
7 months ago
I'm a bit confused; I thought HTTP_DATA might be the right choice since it deals with data, but now I'm not so sure.
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Josphine
7 months ago
I think we practiced a similar question, and I recall that HTTP_REQUEST is the right context for checking headers.
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Estrella
7 months ago
I remember we discussed how the X-Forwarded-For header is used to identify the client's IP, but I'm not sure which event to use here.
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Lizette
7 months ago
This is a good one. I think the answer is option C, since we want to check the header during the HTTP_REQUEST event to determine the appropriate pool.
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Tamekia
8 months ago
I'm a bit confused by the different pool options. I'll need to make sure I understand the purpose of each pool and how they relate to the X-Forwarded-For header.
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Belen
8 months ago
Okay, I've got this. The question is asking about logging the client's true IP address, so I'll want to check the header during the request, not the response.
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Eden
8 months ago
Hmm, the key seems to be determining when to check for the X-Forwarded-For header. I'll need to think through the different HTTP events and which one would be most appropriate.
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Leota
8 months ago
This looks like a tricky one. I'll need to carefully read through the question and options to understand the context and determine the right iRule.
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Lenna
10 months ago
I think the correct iRule is option A.
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