Exam AWS-SysOps topic 1 question 434 discussion

Exam question from Amazon's AWS-SysOps

Question #: 434
Topic #: 1

An Auto Scaling group is running at the desired capacity of 5 instances and receives a trigger from the Cloudwatch Alarm to increase the capacity by 1. The cool down period is 5 minutes.
Cloudwatch sends another trigger after 2 minutes to decrease the desired capacity by 1. What will be the count of instances at the end of 4 minutes?

A. 7
B. 6
C. 4
D. 5

Show Suggested Answer

Suggested Answer: B 🗳️
The cool down period is the time difference between the end of one scaling activity (can be start or terminate) and the start of another one (can be start or terminate). During the cool down period, Au-to Scaling does not allow the desired capacity of the Auto Scaling group to be changed by any other CloudWatch alarm. Thus, in this case the trigger from the second alarm will have no effect.
Reference:
http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/AS_Concepts.html#healthcheck

by albert_kuo at June 24, 2023, 4 a.m.

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dexdinh91

6 months, 2 weeks ago

Selected Answer: B

Cooldown prevents from launching or terminating before effects of previous activities are visible

upvoted 1 times

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Tapkar

10 months ago

Correct answer is B. The cool down period is the time difference between the end of one scaling activity (can be start or terminate) and the start of another one (can be start or terminate). Thus, after auto-scaling was triggered for the first time, it added one instance, giving us six instances in total. The second trigger appeared in 2 minutes, which is within the 5-minutes cool-down period, thus no action was taken. Still we have six instances running.

upvoted 1 times

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albert_kuo

12 months ago

Selected Answer: D

Since the cool down period is 5 minutes and only 2 minutes have passed since the first trigger, the Auto Scaling group is still within the cool down period. During this cool down period, the Auto Scaling group does not launch any new instances or terminate any existing instances. Therefore, at the end of 4 minutes, the count of instances will remain the same as the initial desired capacity of 5.

upvoted 1 times

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