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Exam AWS Certified DevOps Engineer - Professional DOP-C02 topic 1 question 141 discussion

Exam question from Amazon's AWS Certified DevOps Engineer - Professional DOP-C02
Question #: 141
Topic #: 1
[All AWS Certified DevOps Engineer - Professional DOP-C02 Questions]

A company plans to use Amazon CloudWatch to monitor its Amazon EC2 instances. The company needs to stop EC2 instances when the average of the NetworkPacketsIn metric is less than 5 for at least 3 hours in a 12-hour time window. The company must evaluate the metric every hour. The EC2 instances must continue to run if there is missing data for the NetworkPacketsIn metric during the evaluation period.

A DevOps engineer creates a CloudWatch alarm for the NetworkPacketsIn metric. The DevOps engineer configures a threshold value of 5 and an evaluation period of 1 hour.

Which set of additional actions should the DevOps engineer take to meet these requirements?

  • A. Configure the Datapoints to Alarm value to be 3 out of 12. Configure the alarm to treat missing data as breaching the threshold. Add an AWS Systems Manager action to stop the instance when the alarm enters the ALARM state.
  • B. Configure the Datapoints to Alarm value to be 3 out of 12. Configure the alarm to treat missing data as not breaching the threshold. Add an EC2 action to stop the instance when the alarm enters the ALARM state.
  • C. Configure the Datapoints to Alarm value to be 9 out of 12. Configure the alarm to treat missing data as breaching the threshold. Add an EC2 action to stop the instance when the alarm enters the ALARM state.
  • D. Configure the Datapoints to Alarm value to be 9 out of 12. Configure the alarm to treat missing data as not breaching the threshold. Add an AWS Systems Manager action to stop the instance when the alarm enters the ALARM state.
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Suggested Answer: B 🗳️
by vandergun at Nov. 23, 2023, 9:25 a.m.
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zolthar_z
Highly Voted 1 year, 5 months ago
Selected Answer: B
B: This is the reason https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/UsingAlarmActions.html#AddingStopActions
upvoted 7 times
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zijo
Most Recent 8 months, 3 weeks ago
In CloudWatch alarms, datapoints are the individual metric values collected during each period. Here the period is 1 hour and 1 datapoint every hour collected. So 3 datapoints out of 12 is the alrm state because the network threshold has to be less than 5 for atleast 3 hours to Alarm state. The DevOps Engineer sets evaluation for every hour to look for the threshold value of 5. So if 1 hour has no data it is not breaching threshold. If there The alarm evaluates these datapoints against the conditions you set to determine whether it should trigger an action which is stopping an EC2 instance. My explanation for B
upvoted 1 times
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PrasannaBalaji
1 year, 4 months ago
Selected Answer: B
B is correct
upvoted 4 times
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tom_cat
1 year, 5 months ago
Selected Answer: B
I think B
upvoted 3 times
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vandergun
1 year, 5 months ago
Selected Answer: B
B should be corrected
upvoted 4 times
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vandergun
1 year, 5 months ago
B should be corrected
upvoted 3 times
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