Discuss F5 Networks 303 Exam Topic 4 Question 20

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?

Awhen HTTP_DATA {
if {[HTTP::header exists X-Forwarded-For]}{
pool pool_a
} else {
pool pool_b
}
}

Bwhen HTTP_RESPONSE {
if {[HTTP::header exists X-Forwarded-For]}{
pool pool_a
} else {
pool pool_b
}
}

Cwhen HTTP_REQUEST {
if {[HTTP::header exists X-Forwarded-For]}{
pool pool_a
} else {
pool pool_b
}
}

Dwhen HTTP_OPEN {
if {[HTTP::header exists X-Forwarded-For]}{
pool pool_a
} else {
pool pool_b
}
}

Suggested Answer: C

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15 comments · newest first

Quentin 10 months ago

Wait, isn't B just wrong? It should be about requests, not responses.

Marshall 10 months ago

I think A makes more sense, it's about the data.

Nakisha 10 months ago

Definitely C, that's when the request is made.

Jina 11 months ago

A is a solid choice, but I lean towards C too.

Rebecka 11 months ago

I agree with C, but I’m surprised it’s not more obvious!

Chun 11 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?

Tish 11 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.

Josphine 12 months ago

I think we practiced a similar question, and I recall that HTTP_REQUEST is the right context for checking headers.

Estrella 12 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.

Lizette 12 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.

Tamekia 1 year 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.

Belen 1 year 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.

Eden 1 year 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.

Leota 1 year 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.

Lenna 1 year ago

I think the correct iRule is option A.

F5 Networks 303 Exam - Topic 4 Question 20 Discussion