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When distributing loads to multiple ECS instances with an Alibaba Cloud Server Load Balancer (SLB), you can obtain the real IP addresses of users who initiate the requests through _____________. (Choose two.)
Suggested Answer: A, B
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In Alibaba Cloud SLB, Layer-7 (HTTP/HTTPS) services require enabling the 'X-Forwarded-For' header to retrieve the real IP address of clients, while Layer-4 (TCP/UDP) services can obtain the real IP address directly without additional settings.
27 comments · newest first
KE
Kenny
11 months ago
C is definitely wrong, Layer-4 doesn't use that header.
LE
Lettie
11 months ago
D sounds too easy, are you sure about that?
AL
Alease
11 months ago
I thought Layer-4 needed X-Forwarded-For too?
CH
Chuck
12 months ago
B is spot on, no extra settings needed for Layer-4.
MO
Mollie
12 months ago
A is correct, but you need to enable that function first!
GL
Gladys
1 year ago
I recall that Layer-7 services have some extra steps, but I can't remember if Layer-4 needs anything special.
VE
Velda
1 year ago
I practiced a similar question, and I feel like X-Forwarded-For is only for Layer-7, but I could be mixing it up with Layer-4.
KE
Kenia
1 year ago
I think for Layer-4, we can just get the real IPs directly, but I'm not entirely sure if there's anything else we need to do.
LA
Laura
1 year ago
I remember that for Layer-7, we definitely need to enable the "Obtain the Visitors Real IP Address" function to get the real IPs.
VA
Valentin
1 year ago
I'm pretty sure the answer is A and B. The key is understanding the difference between Layer-4 and Layer-7 services, and how SLB handles real IP addresses in each case. I feel confident I've got this one figured out.
LA
Laura
1 year ago
Okay, let me think this through step-by-step. For Layer-7 services, the question says you can get the real IP addresses through the X-Forwarded-For header, but you need to enable a specific function first. And for Layer-4, it seems you can get the real IP addresses directly. So I'll go with A and B as the answer.
ME
Meghann
1 year ago
Hmm, I'm a bit confused about the difference between Layer-4 and Layer-7 services here. I'll need to review the material on SLB and how it handles real IP addresses in more detail before I can be sure of the answer.
ED
Edgar
1 year ago
I'm pretty confident about this one. I think the answer is A and B - for Layer-7 services, you need to enable the "Obtain the Visitors Real IP Address" function to get the real IP addresses through the X-Forwarded-For header, and for Layer-4 services, you can get the real IP addresses directly without any additional settings.
NO
Noel
2 years ago
I'm not sure about option B. I think for Layer-4 services, we still need to enable the function to get the real IP addresses.
ME
Merissa
2 years ago
I agree with Sheron. Option A makes sense because for Layer-7 services, we need to enable the function to obtain real IP addresses.
AL
Alexis
2 years ago
Ha! 'Obtain the Visitors Real IP Address' function, what a mouthful. Bet that one trips up a few people.
CA
Carmen
2 years ago
User 2
LA
Latrice
2 years ago
User 1
SH
Sheron
2 years ago
I think the correct options are A and B.
AL
Alyce
2 years ago
B and D, nice and simple. I'm gonna go with those - no need to complicate things.
NI
Nikita
2 years ago
B and D, nice and simple. I'm gonna go with those - no need to complicate things.
NI
Nida
2 years ago
B) For Layer-4 services, you can obtain the visitors' real IP addresses directly, without any additional settings.
AJ
Aja
2 years ago
A) For Layer-7 services, SLB obtains the real IP addresses of the visitors by means of HTTP Header: X-Forwarded-For, but the ''Obtain the Visitors Real IP Address'' function must be enabled first.
BL
Blair
2 years ago
Hmm, Layer-7 services with X-Forwarded-For, that's pretty straightforward. Gotta love those clear-cut options!
LU
Ludivina
2 years ago
C) For Layer-4 services, SLB obtains the real IP addresses of the visitors by means of the HTTP Header: X-Forwarded-For, but the ''Obtain the Visitors Real IP Address'' function must be enabled first.
TR
Tran
2 years ago
B) For Layer-4 services, you can obtain the visitors' real IP addresses directly, without any additional settings.
MA
Matt
2 years ago
A) For Layer-7 services, SLB obtains the real IP addresses of the visitors by means of HTTP Header: X-Forwarded-For, but the ''Obtain the Visitors Real IP Address'' function must be enabled first.