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 (Number of correct answers: 2)
A . ForLayer-7 services, SLB obtains the real IP addresses of the visitors by means of HTTP Heard: X-Forwarded-For, but the "Obtain the Visitors Real IP Address" function must be enabled first.
B . For Layer-4 services, you can obtain the visitor’s Real lP addresses directly, without any additional settings.
C . ForLayer-4 services, SLB obtains the real IP addresses of the visitors by means of the HTTP Header: X-Forwarded-For, but the "Obtain the Visitor’s Real IP Address" function must be enabled first.
D . For Layer-7 services, you can obtain the visitors’ real IP addresses directly, without any additional settings.
Answer: A B
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