Alibaba Cloud Certified Associate – Cloud Computing — Question 12

Auto Scaling is a management service that can automatically adjust elastic computing resources based on your business needs and policies. It supports adding an existing ECS instance into the scaling group but imposes certain requirements on instance region. In this case, which of the following statements is true?

Answer options

• A. The instance and the scaling group must be in the same region but not necessarily the same zone.
• B. The instance and the scaling group must be in the same region and zone.
• C. The instance and the scaling group can be in different regions and zones.
• D. Each scaling group can span up to two regions. After adding the ECS instance, the number of regions of all the ECS instances in the scaling group must be no greater than two.

Correct answer: A

Explanation

The correct answer is A because Auto Scaling requires that the instance and the scaling group be in the same region, but they do not have to be in the same availability zone. Option B is incorrect as it states that both must be in the same zone, which is not a requirement. Option C is incorrect because it suggests that different regions and zones are allowed, which contradicts Auto Scaling's requirements. Option D is misleading since it implies a broader regional capability than what Auto Scaling supports.