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Exam AWS-SysOps topic 1 question 140 discussion

Exam question from Amazon's AWS-SysOps

Question #: 140
Topic #: 1

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

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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Comments

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albert_kuo

8 months, 2 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.

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Finger41

1 year, 7 months ago

Selected Answer: A

https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/AlarmThatSendsEmail.html Its in Alarm

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aidenpearce01

1 year, 11 months ago

So every time EC2 restart , the CloudWatch also restart and it's take 10 minutes to start logging ?

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AMohanty

2 years, 3 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

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hou0220

2 years, 4 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." 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.

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Hypercuber

2 years, 4 months 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

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fagas

2 years, 4 months 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??

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kenkct

2 years, 4 months ago

15 minutes is a threshold for the ACW to return status OK. if less than 15 minutes, it should return "insufficient data".

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ImranR

2 years, 4 months 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...

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Flaviu6373

1 year, 11 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

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Jshuen

2 years, 4 months ago

https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/AlarmThatSendsEmail.html

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awscertified

2 years, 4 months ago

ans B. OK

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