The answer is that the alarm is missing the required InstanceId dimension. CloudWatch metrics for EC2, such as CPUUtilization, are published as a time-series data stream uniquely identified by the InstanceId dimension; without it, the alarm cannot match the metric data emitted by your EC2 instance, so it remains in INSUFFICIENT_DATA or OK state even when CPU usage exceeds the threshold. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this tests your understanding that EC2 metrics are dimensional—a common trap is assuming a simple metric name like CPUUtilization is enough, when in fact you must specify the InstanceId to target a specific instance. Remember the memory tip: "No ID, no alarm"—if you omit the InstanceId, the alarm has no data to evaluate.
SOA-C02 Monitoring, Logging, and Remediation Practice Question
This SOA-C02 practice question tests your understanding of monitoring, logging, and remediation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
Refer to the exhibit.
CloudWatch Alarm configuration:
{
"AlarmName": "HighCPU",
"AlarmDescription": "Alarm if CPU exceeds 90% for 5 minutes",
"MetricName": "CPUUtilization",
"Namespace": "AWS/EC2",
"Statistic": "Average",
"Period": 60,
"EvaluationPeriods": 5,
"Threshold": 90,
"ComparisonOperator": "GreaterThanThreshold",
"AlarmActions": ["arn:aws:sns:us-east-1:123456789012:MyTopic"]
}
Refer to the exhibit. A SysOps administrator creates the CloudWatch Alarm shown. However, the alarm never enters ALARM state even though the CPU utilization of the EC2 instance is consistently above 90%. What is the most likely reason?
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.
Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The alarm is missing the InstanceId dimension.
The alarm never enters ALARM state because it is missing the required `InstanceId` dimension. CloudWatch metrics for EC2, such as `CPUUtilization`, are published with the `InstanceId` dimension to uniquely identify the data stream. Without specifying this dimension in the alarm configuration, CloudWatch cannot match the alarm to the metric data emitted by the EC2 instance, so the alarm remains in INSUFFICIENT_DATA or OK state regardless of actual CPU usage.
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 alarm is missing the InstanceId dimension.
Why this is correct
Without a dimension, the alarm does not know which instance to monitor.
Clue confirmation
The clue words "most likely", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The threshold is set too high; it should be 80%.
Why it's wrong here
The CPU is above 90%, so the threshold is not the issue.
✗
The evaluation periods are too few.
Why it's wrong here
5 periods of 1 minute each is 5 minutes, as intended.
✗
The statistic should be Maximum instead of Average.
Why it's wrong here
Average is valid; if average is above 90%, it should trigger.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates focus on tuning threshold or evaluation periods, overlooking the fundamental requirement that CloudWatch alarms must include the correct dimensions to match the metric data stream.
Detailed technical explanation
How to think about this question
CloudWatch metrics are organized by namespace and dimensions; for EC2, the `AWS/EC2` namespace requires the `InstanceId` dimension to uniquely identify each instance's data stream. If you create an alarm without specifying the `InstanceId`, CloudWatch cannot resolve which metric stream to monitor, resulting in the alarm never receiving data points and staying in INSUFFICIENT_DATA state. In real-world scenarios, this is a common misconfiguration when copying alarm definitions across instances or using CloudFormation templates without proper dimension mapping.
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, Logging, and Remediation — This question tests Monitoring, Logging, and Remediation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The alarm is missing the InstanceId dimension. — The alarm never enters ALARM state because it is missing the required `InstanceId` dimension. CloudWatch metrics for EC2, such as `CPUUtilization`, are published with the `InstanceId` dimension to uniquely identify the data stream. Without specifying this dimension in the alarm configuration, CloudWatch cannot match the alarm to the metric data emitted by the EC2 instance, so the alarm remains in INSUFFICIENT_DATA or OK state regardless of actual CPU usage.
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely", "never". 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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Question Discussion
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