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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
8 months ago
Wait, isn't B just wrong? It should be about requests, not responses.
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Marshall
9 months ago
I think A makes more sense, it's about the data.
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Nakisha
9 months ago
Definitely C, that's when the request is made.
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Jina
9 months ago
A is a solid choice, but I lean towards C too.
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Rebecka
9 months ago
I agree with C, but I’m surprised it’s not more obvious!
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Chun
10 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
10 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
10 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
10 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
10 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
11 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
11 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
11 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
11 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
1 year ago
I think the correct iRule is option A.
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