Exam AWS Certified SysOps Administrator - Associate topic 1 question 474 discussion

Exam question from Amazon's AWS Certified SysOps Administrator - Associate

Question #: 474
Topic #: 1

[All AWS Certified SysOps Administrator - Associate Questions]

A company is using an Amazon EC2 Auto Scaling group to support a workload. A SysOps administrator finds that the Auto Scaling group is configured with two similar scaling policies.

One scaling policy adds 5 instances when CPU utilization reaches 80%. The other scaling policy adds 10 instances when CPU utilization reaches 80%.

What will happen when CPU utilization reaches the 80% threshold?

A. Amazon EC2 Auto Scaling will add 5 instances.
B. Amazon EC2 Auto Scaling will add 10 instances.
C. Amazon EC2 Auto Scaling will add 15 instances.
D. The Auto Scaling group will not scale because of conflicting policies.

Show Suggested Answer

Suggested Answer: B 🗳️

by Aamee at Oct. 29, 2024, 6:16 p.m.

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Canale0107

1 day, 10 hours ago

Selected Answer: C

If multiple scaling policies are tied to the same CloudWatch alarm, Auto Scaling applies only the policy with the largest effect (in this case, +10 instances). However, if the policies are linked to different alarms, both will trigger independently, and their actions will combine (+5 and +10 = +15 instances). The question does not state that they share the same alarm, so the usual interpretation is that both policies fire. Correct answer: C. Auto Scaling will add 15 instances.

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robotgeek

10 months ago

Selected Answer: B

When these situations occur, Amazon EC2 Auto Scaling chooses the policy that provides the largest capacity for both scale out and scale in. https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-scale-based-on-demand.html?utm_source=chatgpt.com#multiple-scaling-policy-resolution

upvoted 3 times

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examaws

11 months ago

Selected Answer: D

D. The Auto Scaling group will not scale because of conflicting policies. This is correct because Auto Scaling does not execute either policy when they conflict. The presence of two policies that trigger at the same threshold with different scaling actions leads to a situation where no scaling occurs.

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numark

1 year ago

I thought it was 10 as well, but chatGPT stated 15>>>> When the CPU utilization of the Auto Scaling group reaches the 80% threshold, both scaling policies will trigger concurrently because they are configured with the same condition (CPU utilization reaching 80%). As a result: The first scaling policy will attempt to add 5 instances. The second scaling policy will attempt to add 10 instances. This will result in the Auto Scaling group trying to launch a total of 15 new instances simultaneously.

upvoted 1 times

numark

11 months, 3 weeks ago

In the scenario described, if an Amazon EC2 Auto Scaling group has two scaling policies that both trigger at the same CPU utilization level (80% in this case), and if both policies are active, then both will be executed when the threshold is reached. This means that if one policy adds 5 instances and the other adds 10 instances when the CPU utilization hits 80%, then a total of 15 instances will be added to the Auto Scaling group if the threshold is met and sustained for the duration specified by the policy's cool-down period.In a real-world scenario, the execution of scaling policies would also be influenced by the cooldown timers set within the Auto Scaling group configuration. If the cooldown period is still in effect from a previous scaling activity, it may temporarily prevent another scaling activity from being triggered by the second policy. But assuming that both policies are able to trigger without any cooldown conflicts, the described behavior (adding a total of 15 instances) would occur.

upvoted 1 times

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Aamee

1 year ago

Selected Answer: B

Logically, 10 instances should scale up with 80% utilization as it may not add with the previous instances so going with B here...

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