CloudWatch Alarm Triggering Logic with Consecutive Periods and Strict Greater-Than
This DOP-C02 practice question tests your understanding of monitoring and logging. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Refer to the exhibit. An alarm is configured as shown. The CPU utilization averages 85% for 10 minutes, then spikes to 95% for the next 5 minutes, and returns to 80%. How many times will the SNS topic receive a notification?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
0
The alarm has a threshold of 85%, with strict greater-than comparison (not greater than or equal). The data shows two 5-minute periods averaging exactly 85% (which does not breach) and one period at 95% (which breaches). The alarm requires 3 consecutive breach periods to change from OK to ALARM; only 1 breach period is present. Therefore, the alarm remains in OK state and no notification is sent. The SNS topic receives 0 notifications.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
0
Why this is correct
Correct; the alarm never enters ALARM state.
Related concept
Read the scenario before looking for a memorised answer.
✗
1
Why it's wrong here
Incorrect; it would need 2 consecutive high periods.
✗
2
Why it's wrong here
Incorrect; only one period of high CPU.
✗
3
Why it's wrong here
Incorrect; no alarm transition occurs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the alarm triggers immediately when the metric exceeds the threshold, but CloudWatch requires a specified number of consecutive evaluation periods (datapoints) to breach before changing state, and the threshold comparison is strict (greater than, not greater than or equal).
Detailed technical explanation
How to think about this question
CloudWatch alarms use a 'evaluation periods' concept where the alarm state changes only after a specified number of consecutive datapoints breach the threshold. For a 5-minute period, the alarm evaluates each datapoint; if 3 out of 3 consecutive datapoints are above 85%, it enters ALARM. The 'treat missing data as missing' default means gaps do not count as breaching. In this scenario, the 10-minute average of 85% is exactly at the threshold, which is not considered a breach (strictly greater than), so only the 95% spike counts as a breach, but it takes 3 consecutive breaches to trigger the alarm.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Monitoring and Logging — This question tests Monitoring and Logging — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 0 — The alarm has a threshold of 85%, with strict greater-than comparison (not greater than or equal). The data shows two 5-minute periods averaging exactly 85% (which does not breach) and one period at 95% (which breaches). The alarm requires 3 consecutive breach periods to change from OK to ALARM; only 1 breach period is present. Therefore, the alarm remains in OK state and no notification is sent. The SNS topic receives 0 notifications.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Variation 1. Refer to the exhibit. The CloudWatch alarm is set on CPUUtilization. The instance's CPU at 10:00 is 75%, at 10:05 is 82%, and at 10:10 is 85%. Will the alarm trigger?
hard
A.Yes, because the CPU exceeded 80% at 10:05.
✓ B.Yes, but only after 10:10 when two consecutive periods are above the threshold.
C.No, because the alarm uses Average statistic and the average over the entire time is below 80%.
D.No, because the first data point at 10:00 is below the threshold.
Why B: The alarm evaluates 2 consecutive periods (each 5 minutes). At 10:05, the average for that period is 82% (above 80), but the previous period (10:00) average is 75% (below 80). So only one period is breached. At 10:10, the average for that period is 85% (above 80), and the previous period (10:05) average is 82% (above 80). So two consecutive periods are breached, triggering the alarm.
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Question Discussion
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