The answer is that the CloudWatch alarm and the Application Load Balancer are in different AWS Regions. CloudWatch alarms can only evaluate metrics from the same Region where the alarm is created; they cannot ingest metric data from a different Region. When the alarm’s metric, such as HTTPCode_ELB_5XX_Count, never receives data points because the ALB resides elsewhere, the alarm lacks sufficient data to transition to OK or ALARM, leaving it stuck in INSUFFICIENT_DATA. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of CloudWatch’s regional scope and the common pitfall of cross-Region monitoring. A frequent trap is assuming CloudWatch can aggregate metrics globally, but it cannot—each alarm is region-locked. Remember the memory tip: “Alarms are regional hermits; they only see data from their own backyard.”
SOA-C02 Monitoring, Logging, and Remediation Practice Question
This SOA-C02 practice question tests your understanding of monitoring, logging, and remediation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company runs a web application on EC2 instances behind an Application Load Balancer. The SysOps administrator creates a CloudWatch alarm on the ALB's HTTPCode_ELB_5XX_Count metric to trigger an SNS notification when there are many 5xx errors. However, the alarm remains in INSUFFICIENT_DATA state. What is a likely cause?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ALB and the CloudWatch alarm are in different AWS Regions.
CloudWatch alarms can only evaluate metrics from the same AWS Region in which the alarm is created. If the ALB and the CloudWatch alarm are in different Regions, the alarm will never receive metric data points, causing it to remain in INSUFFICIENT_DATA state. This is a common cross-Region limitation for CloudWatch metrics.
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 HTTPCode_ELB_5XX_Count metric is not available for ALBs.
The ALB and the CloudWatch alarm are in different AWS Regions.
Why this is correct
CloudWatch alarms cannot monitor metrics from a different region unless using cross-region functionality.
Related concept
Read the scenario before looking for a memorised answer.
✗
The IAM role for CloudWatch does not have permission to read the ALB metrics.
Why it's wrong here
CloudWatch alarms do not need permissions to read metrics; they are based on the same account.
✗
The alarm's period is set to 1 minute, but the metric is published every 5 minutes.
Why it's wrong here
ALB metrics are published every 1 minute.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often overlook the regional scope of CloudWatch metrics and alarms, assuming that metrics are globally accessible, when in fact they are strictly regional.
Detailed technical explanation
How to think about this question
CloudWatch metrics are regional by design; each metric is stored in the Region where the resource resides. When you create an alarm, it subscribes to the metric stream in that specific Region. If you attempt to create an alarm in a different Region, the metric namespace and dimension do not match any published data, so the alarm never receives a data point and stays in INSUFFICIENT_DATA. This is a common pitfall when using multi-Region architectures or cross-Region monitoring dashboards.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 ALB and the CloudWatch alarm are in different AWS Regions. — CloudWatch alarms can only evaluate metrics from the same AWS Region in which the alarm is created. If the ALB and the CloudWatch alarm are in different Regions, the alarm will never receive metric data points, causing it to remain in INSUFFICIENT_DATA state. This is a common cross-Region limitation for CloudWatch metrics.
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.
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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