Exam AWS DevOps Engineer Professional topic 1 question 76 discussion

Exam question from Amazon's AWS DevOps Engineer Professional

Question #: 76
Topic #: 1

[All AWS DevOps Engineer Professional Questions]

A company has an application that runs on 12 Amazon EC2 instances. The instances run in an Amazon EC2 Auto Scaling group across three Availability Zones.
On a typical day each EC2 instance has 30% CPU utilization during business hours and 10% CPU utilization after business hours. The CPU utilization increases suddenly in the first few minutes of business hours each day. Other increases in CPU utilization are gradual. A DevOps engineer needs to optimize costs while maintaining or improving the application's reliability.
Which solution meets these requirements?

A. Configure a target tracking scaling policy that is based on the Auto Scaling group's average CPU utilization, and set a target of 75%. Create a scheduled action for the Auto Scaling group to adjust the desired capacity to six instances just before business hours begin.
B. Configure the Auto Scaling group with two scheduled actions for Amazon EC2 Auto Scaling. Configure one action to start nine EC2 instances at the start of business hours. Configure the other action to stop nine instances at the end of business hours.
C. Change to an AWS Application Auto Scaling group. Configure a target tracking scaling policy that is based on the Auto Scaling group's average CPU utilization, and set a target of 75%. Create a scheduled action for the Auto Scaling group to adjust the minimum number of instances to three instances at the end of business hours and to reset the number to six instances before business hours begin.
D. Change to an AWS Application Auto Scaling group. Configure a target tracking scaling policy that is based on the Auto Scaling group's average CPU utilization, and set a target of 75%. Create a scheduled action to terminate nine instances each evening at the end of business hours.

Show Suggested Answer

Suggested Answer: A 🗳️

by ohcn at Sept. 1, 2022, 9:30 p.m.

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Comments

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Goozian

Highly Voted 2 years, 9 months ago

Selected Answer: A

C & D are wrong. Application Auto Scaling isn't for EC2 : https://docs.aws.amazon.com/autoscaling/application/userguide/what-is-application-auto-scaling.html B can not be a good option, as it just starts and terminates EC2 instances regardless of the real CPU utilization. A is the most appropriate

upvoted 11 times

Scofield_12

2 years, 6 months ago

Application autoscaling can also be applied to EC2 instances, it only has a broader application, compared to EC2 Autoscaling. But the catch here is we want a solution that address both during working hrs and after working hrs (especially when there is low traffic). Option A only address during working hrs.

upvoted 1 times

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CloudMan01

Highly Voted 2 years, 8 months ago

Answer is A, AWS Application Auto Scaling group isn't provisioned for EC2, so C&D are wrong.

upvoted 7 times

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vn_thanhtung

Most Recent 1 year, 1 month ago

Selected Answer: C

C is Correct

upvoted 1 times

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Varshtiw

2 years, 3 months ago

D is Right.

upvoted 1 times

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DerekKey

2 years, 4 months ago

Selected Answer: A

A - correct B - wrong - you can not add or remove X instances. You must explicitly specify either desired min or max. C & D - wrong - we are scaling EC2 not other AWS services

upvoted 2 times

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kopper2019

2 years, 5 months ago

EC2 is not one of the services that can use Application Auto scaling. https://docs.aws.amazon.com/autoscaling/application/userguide/integrated-services-list.html so A seems to be right

upvoted 2 times

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Bulti

2 years, 5 months ago

Answer is A. Target tracking scaling policy us gong to be more coat effective than just scheduled scaling action. AWS application auto scaling group is used beyond EC2 so C and D are wrong.

upvoted 1 times

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