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Alibaba Exam ACA-Cloud1 Topic 5 Question 90 Discussion

Actual exam question for Alibaba's ACA-Cloud1 exam
Question #: 90
Topic #: 5
[All ACA-Cloud1 Questions]

A company uses Alibaba Cloud SLB and Auto Scaling at the same time, hoping this combination can help save O&M cost and provide a stable and reliable system.

However, because they do not have relevant experience, the company's engineers listed some precautions based on their understanding, and turned the list to you for advice.

As an expert of Alibaba Cloud, you tell them only________is correct.

Show Suggested Answer Hide Answer
Suggested Answer: A

SLB and Auto Scaling are two Alibaba Cloud services that can work together to provide high availability, scalability, and performance for your applications. SLB is a load balancing service that distributes incoming traffic across multiple ECS instances. Auto Scaling is a service that automatically adjusts the number of ECS instances based on your business needs. When you use SLB and Auto Scaling together, you need to follow some best practices and precautions to ensure the optimal performance and reliability of your system.One of the precautions is that SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling1. Health Check is a feature of SLB that monitors the health status of the backend ECS instances. If an ECS instance becomes unhealthy or fails, SLB automatically stops sending traffic to that instance and redirects the traffic to other healthy instances. This ensures that your application can continue to serve user requests without interruption. Health Check is also essential for Auto Scaling, because Auto Scaling relies on the health status reported by SLB to decide whether to add or remove ECS instances. If an ECS instance is unhealthy, Auto Scaling will automatically replace it with a new one. If the traffic increases and the average health status of the ECS instances decreases, Auto Scaling will automatically add more instances. If the traffic decreases and the average health status of the ECS instances increases, Auto Scaling will automatically remove some instances. Therefore, Health Check is a prerequisite for using SLB and Auto Scaling together. If you disable Health Check, SLB and Auto Scaling will not be able to communicate with each other and coordinate their actions. This may result in performance degradation, service interruption, or resource waste. The other options are incorrect, because they are not necessary or relevant for using SLB and Auto Scaling together. The backend ECS instances under the same SLB instance can have different operating systems, configurations, and scaling groups, as long as they can provide the same service and respond to the same requests. SLB and Auto Scaling do not impose any restrictions on these aspects of the ECS instances.Reference:Associate SLB instances with or disassociate SLB instances from a scaling group


by Tijuana at Jul 12, 2025, 06:02 AM

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Gerri
17 days ago
Wait, do I need to make sure the servers are all running the same OS? That's a weird requirement.
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Niesha
18 days ago
Haha, this is like trying to keep a bunch of kittens in the same basket. Good luck with that!
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Monroe
14 days ago
A) SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling
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Elsa
22 days ago
I see your point, maybe D is not the best option after all.
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Lettie
26 days ago
I agree with Carlee, having Health Check enabled ensures the system's stability.
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Carlee
28 days ago
But wouldn't it make sense for SLB instances to have Health Check enabled?
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Elsa
1 months ago
I disagree, I believe the correct answer is D.
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Isidra
1 months ago
I think option D makes the most sense. If the servers have different configurations, it could cause issues with load balancing.
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Phillip
1 months ago
I'm not so sure about that. Don't all the backend servers need to be in the same Scaling Group as well?
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Theodora
6 days ago
I'm not so sure about that. Don't all the backend servers need to be in the same Scaling Group as well?
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Alana
9 days ago
A) SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling
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Carlee
1 months ago
I think the correct answer is A.
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Mayra
1 months ago
Option A is definitely the correct one. Health check is essential for SLB to work with Auto Scaling.
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Dusti
18 days ago
Definitely, without health check, the system won't be able to scale effectively.
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Ruth
22 days ago
That makes sense. Health check is crucial for the system to function properly.
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Mitzie
1 months ago
A) SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling
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