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Exam AWS-SysOps topic 1 question 140 discussion

Exam question from Amazon's AWS-SysOps
Question #: 140
Topic #: 1
[All AWS-SysOps Questions]

A user has setup an EBS backed instance and a CloudWatch alarm when the CPU utilization is more than 65%. The user has setup the alarm to watch it for 5 periods of 5 minutes each. The CPU utilization is 60% between 9 AM to 6 PM. The user has stopped the EC2 instance for 15 minutes between 11 AM to 11:15
AM. What will be the status of the alarm at 11:30 AM?

  • A. Alarm
  • B. OK
  • C. Insufficient Data
  • D. Error
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
Amazon CloudWatch alarm watches a single metric over a time period the user specifies and performs one or more actions based on the value of the metric relative to a given threshold over a number of time periods. The state of the alarm will be OK for the whole day. When the user stops the instance for three periods the alarm may not receive the data
by awscertified at March 5, 2020, 12:35 a.m.
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albert_kuo
4 months, 4 weeks ago
Selected Answer: B
Even though the EC2 instance was stopped for 15 minutes between 11 AM to 11:15 AM, the CloudWatch alarm evaluates the CPU utilization based on the available data points. Since the CPU utilization remained below the threshold of 65% before and after the instance stoppage, the alarm status will remain "OK" at 11:30 AM.
upvoted 1 times
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Finger41
1 year, 3 months ago
Selected Answer: A
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/AlarmThatSendsEmail.html Its in Alarm
upvoted 1 times
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aidenpearce01
1 year, 7 months ago
So every time EC2 restart , the CloudWatch also restart and it's take 10 minutes to start logging ?
upvoted 1 times
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AMohanty
1 year, 11 months ago
" user has programmed the alarm to monitor it for five 5-minute intervals" -> 5 x 5 = 25 mins After 25 mins it would give OK status At 15th minute status would be INSUFFICIENT DATA
upvoted 1 times
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hou0220
2 years ago
"INSUFFICIENT_DATA – The alarm has just started, the metric is not available, or not enough data is available for the metric to determine the alarm state." This question restarted EC2 instance, not the alarm. From alarm point of view, the instance CPU usage never breach 65% threshold. So answer is A.
upvoted 1 times
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Hypercuber
2 years ago
The answer should be C. After starting at 11:15 AM, it will be only 3 periods of 5 minutes to 11:30 AM, so there is insufficient data to tell if status should be OK or not
upvoted 2 times
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fagas
2 years ago
" When the user stops the instance for three periods the alarm may not receive the data " So there were insufficient data!! how come is the answer is B??
upvoted 1 times
kenkct
2 years ago
15 minutes is a threshold for the ACW to return status OK. if less than 15 minutes, it should return "insufficient data".
upvoted 1 times
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ImranR
2 years ago
15 minutes means 3 Periods each of 5 minutes...5 periods means 25 minutes for watch....After 15 minutes Instance will be started...so status will be OK...
upvoted 1 times
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Flaviu6373
1 year, 8 months ago
INSUFFICIENT_DATA – The alarm has just started, the metric is not available, or not enough data is available for the metric to determine the alarm state. in conclusion, alarm is still on, just the EC2 was started 15 minutes ago. Correct answer B
upvoted 1 times
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Jshuen
2 years ago
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/AlarmThatSendsEmail.html
upvoted 1 times
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awscertified
2 years, 1 month ago
ans B. OK
upvoted 3 times
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