The answer is that the alarm remains in the 'OK' state due to insufficient data points for the metric evaluation, not because of a configuration error with SNS or the subscription. CloudWatch alarms evaluate based on the number of data points within the specified evaluation periods; if the metric `CPUUtilization` is published with a period of 5 minutes but some data points are missing or delayed, the alarm cannot complete the required two consecutive evaluations of the threshold being exceeded. This scenario tests your understanding of how CloudWatch alarm evaluation logic works, a critical concept for the AWS Certified DevOps Engineer Professional DOP-C02 exam, where the common trap is assuming that visible metric values automatically trigger state changes. Remember: an alarm only transitions to ALARM when it has enough *valid* data points to evaluate all specified periods—think of it as needing a full "puzzle" of data, not just a few pieces.
DOP-C02 Monitoring and Logging Practice Question
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.
A DevOps engineer is responsible for monitoring an AWS environment that includes multiple EC2 instances running a web application. The engineer needs to set up a solution that sends an email alert when the average CPU utilization across all instances exceeds 80% for 10 consecutive minutes. The engineer has created a CloudWatch alarm with the metric `CPUUtilization` aggregated across all instances using the statistic `Average` and a period of 5 minutes. The alarm is set to trigger when the metric exceeds 80% for 2 consecutive periods (10 minutes). The alarm's action is configured to send a notification to an Amazon SNS topic that has an email subscription. However, the engineer is not receiving the email alerts. The engineer verified that the SNS topic exists and the email subscription is confirmed. The CloudWatch alarm shows that the metric value exceeded the threshold for 2 periods, but the alarm state is still 'OK'. What is the MOST likely reason for this?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Why wrong: The engineer verified the subscription is confirmed.
B
The metric `CPUUtilization` is not being published to CloudWatch.
Why wrong: The alarm shows metric values, so it is being published.
C
The CloudWatch alarm requires 2 consecutive evaluation periods with the metric exceeding the threshold, but the alarm is still evaluating because of insufficient data points.
If the metric has missing data points, the alarm may not evaluate to ALARM.
D
The SNS topic is not configured to allow CloudWatch to publish to it.
Why wrong: CloudWatch can publish to SNS topics without additional configuration.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The CloudWatch alarm requires 2 consecutive evaluation periods with the metric exceeding the threshold, but the alarm is still evaluating because of insufficient data points.
Option A is correct because the alarm must be in the 'ALARM' state to send notifications. If the metric exceeds the threshold but the alarm does not transition to ALARM, it may be due to missing data points or insufficient data to evaluate. Option B is wrong because the SNS topic appears to be correctly configured. Option C is wrong because the email subscription is confirmed. Option D is wrong because the metric is being published; the alarm shows values.
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.
✗
The email subscription is not confirmed.
Why it's wrong here
The engineer verified the subscription is confirmed.
✗
The metric `CPUUtilization` is not being published to CloudWatch.
Why it's wrong here
The alarm shows metric values, so it is being published.
✓
The CloudWatch alarm requires 2 consecutive evaluation periods with the metric exceeding the threshold, but the alarm is still evaluating because of insufficient data points.
Why this is correct
If the metric has missing data points, the alarm may not evaluate to ALARM.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The SNS topic is not configured to allow CloudWatch to publish to it.
Why it's wrong here
CloudWatch can publish to SNS topics without additional configuration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
The alarm shows metric values, so it is being published.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: The CloudWatch alarm requires 2 consecutive evaluation periods with the metric exceeding the threshold, but the alarm is still evaluating because of insufficient data points. — Option A is correct because the alarm must be in the 'ALARM' state to send notifications. If the metric exceeds the threshold but the alarm does not transition to ALARM, it may be due to missing data points or insufficient data to evaluate. Option B is wrong because the SNS topic appears to be correctly configured. Option C is wrong because the email subscription is confirmed. Option D is wrong because the metric is being published; the alarm shows values.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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