Alibaba Exam ACA-Cloud1 Topic 1 Question 91 Discussion

Actual exam question for Alibaba's ACA-Cloud1 exam

Question #: 91
Topic #: 1

When using Alibaba Cloud SLB, you can set different weights for backend ECS instances. The higher the weight of a backend ECS instance, the more load will be assigned to it. If an SLB instance has 5 ECS instances in the backend server pool, all of which are healthy. Among these 5 ECS instances, the weight of ecs_inst1 is set to 100. Which of the following statements is correct?

AWe do not know the weight settings of the remaining 4 ECS instances, so we cannot tell what would happen.

B100% of loads will be assigned to ecs_inst1, and the rest 4 ECS instances will stay idle.

CBased on SLB's working mechanism, approximately 20% of loads will be assigned to ecs_inst1.

DBased on request level parameters of external requests, all requests with a request level parameter of 100 will be transferred to ecs_inst1.

Show Suggested Answer

Suggested Answer: A

Alibaba Cloud Server Load Balancer (SLB) is a service that distributes network traffic across multiple ECS instances to improve the service capabilities of applications. SLB supports different load balancing algorithms, such as round robin, weighted round robin, and least connections. When using the weighted round robin algorithm, SLB assigns different weights to backend ECS instances based on their processing capabilities. The higher the weight of a backend ECS instance, the more requests it will receive from SLB. However, the weight of a backend ECS instance is not the only factor that determines the load distribution. The number and the weight of other backend ECS instances in the same server group also affect the load balancing result. Therefore, without knowing the weight settings of the remaining 4 ECS instances, we cannot tell what would happen to the load distribution among the 5 ECS instances. The other statements are incorrect because they assume a fixed or proportional load distribution based on the weight of ecs_inst1, which is not necessarily true.

Alibaba Cloud Server Load Balancer

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by King at Aug 03, 2025, 11:52 PM

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