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Alibaba ACA-Cloud1 Exam - Topic 5 Question 90 Discussion

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

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.

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


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31 comments · newest first
AL
Aliza 10 months ago
A is the only one that makes sense here.
CO
Cory 10 months ago
I disagree, B is important too! OS compatibility matters.
AR
Arlette 11 months ago
Wait, I thought D was a requirement! That's surprising!
LA
Lamonica 11 months ago
C seems off, scaling groups can be mixed, right?
TA
Tamekia 11 months ago
A is definitely the right choice! Health checks are crucial.
LA
Lashonda 11 months ago
I recall something about scaling groups, but I can't remember if all backend servers need to be in the same group as mentioned in C. It seems a bit restrictive.
HA
Harrison 12 months ago
I practiced a similar question, and I think D makes sense because having the same configuration could help with consistency, but I'm not completely confident.
LO
Lottie 12 months ago
I'm not entirely sure, but I feel like the operating system requirement in B might not be necessary for SLB to function with Auto Scaling.
SI
Sina 12 months ago
I think I remember that health checks are really important for SLB and Auto Scaling to work properly, so maybe A is the right answer?
LO
Lonny 1 year ago
Hmm, this is an interesting scenario. I would need to consider the use case and the specific requirements of the company. Without more context, I'd say C is the safest bet, but I'd want to double-check the documentation to be sure.
EN
Ena 1 year ago
The key here is that SLB and Auto Scaling need to work seamlessly together. Option C is the only one that ensures the backend servers are properly managed by the Scaling Group.
DE
Denise 1 year ago
I'm not sure about this one. The question mentions using SLB and Auto Scaling together, but I'm not clear on the specific requirements. I'll have to review the documentation more carefully.
MA
Margurite 1 year ago
This seems straightforward. I think the correct answer is C - all backend servers under the same SLB instance must be in the same Scaling Group.
GE
Gerri 1 year ago
Wait, do I need to make sure the servers are all running the same OS? That's a weird requirement.
NI
Niesha 1 year ago
Haha, this is like trying to keep a bunch of kittens in the same basket. Good luck with that!
SE
Selma 1 year ago
↳ replying to Niesha
C) All backend servers under the same SLB instance must be in the same Scaling Group
AN
Annalee 1 year ago
↳ replying to Niesha
B) All ECS instances under the same SLB instance must be running on the same operating system
MO
Monroe 1 year ago
↳ replying to Niesha
A) SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling
EL
Elsa 1 year ago
I see your point, maybe D is not the best option after all.
LE
Lettie 1 year ago
I agree with Carlee, having Health Check enabled ensures the system's stability.
CA
Carlee 1 year ago
But wouldn't it make sense for SLB instances to have Health Check enabled?
EL
Elsa 1 year ago
I disagree, I believe the correct answer is D.
IS
Isidra 1 year ago
I think option D makes the most sense. If the servers have different configurations, it could cause issues with load balancing.
PH
Phillip 1 year ago
I'm not so sure about that. Don't all the backend servers need to be in the same Scaling Group as well?
TH
Theodora 1 year ago
↳ replying to Phillip
I'm not so sure about that. Don't all the backend servers need to be in the same Scaling Group as well?
AL
Alana 1 year ago
↳ replying to Phillip
A) SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling
CA
Carlee 1 year ago
I think the correct answer is A.
MA
Mayra 1 year ago
Option A is definitely the correct one. Health check is essential for SLB to work with Auto Scaling.
DU
Dusti 1 year ago
↳ replying to Mayra
Definitely, without health check, the system won't be able to scale effectively.
RU
Ruth 1 year ago
↳ replying to Mayra
That makes sense. Health check is crucial for the system to function properly.
MI
Mitzie 1 year ago
↳ replying to Mayra
A) SLB instances must have Health Check enabled, or they cannot be used together with Auto Scaling
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