- A
Create a CloudWatch dashboard to visualize the error metrics across all instances.
Why wrong: Creating a CloudWatch dashboard aggregates error metrics across all instances, preventing per-instance troubleshooting.
- B
Enable detailed monitoring on the EC2 instances to get 1-minute CloudWatch metrics.
Detailed monitoring provides 1-minute CloudWatch metrics for each EC2 instance, allowing granular visibility into per-instance error rates.
- C
Enable VPC Flow Logs to capture traffic to each instance.
Why wrong: VPC Flow Logs capture network traffic metadata (IPs, ports, protocols) and do not include application error metrics.
- D
Enable ALB access logs and store them in Amazon S3 for analysis.
Why wrong: ALB access logs provide request-level data but are not real-time and require additional processing to correlate errors to specific instances.
DOP-C02 Detailed monitoring Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. 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. A key principle to apply: detailed monitoring. 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 is running a critical application on Amazon EC2 instances behind an Application Load Balancer (ALB). The operations team notices that the application's error rate has increased significantly in the last 30 minutes, but they are unable to identify the root cause because the metrics are aggregated across all instances. Which solution would provide the MOST granular visibility into individual instance performance?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enable detailed monitoring on the EC2 instances to get 1-minute CloudWatch metrics.
Detailed monitoring on EC2 instances provides 1-minute CloudWatch metrics per instance, enabling granular visibility into individual instance performance, which is essential for identifying the root cause of increased error rates. Option A is incorrect because a CloudWatch dashboard aggregates metrics across all instances and does not provide per-instance granularity. Option C is incorrect because VPC Flow Logs capture network traffic metadata (source/destination IPs, ports, etc.) and not application error metrics. Option D is incorrect because ALB access logs provide request-level data but require additional analysis to extract per-instance error rates and are not real-time.
Key principle: Detailed monitoring
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a CloudWatch dashboard to visualize the error metrics across all instances.
Why it's wrong here
Creating a CloudWatch dashboard aggregates error metrics across all instances, preventing per-instance troubleshooting.
- ✓
Enable detailed monitoring on the EC2 instances to get 1-minute CloudWatch metrics.
Why this is correct
Detailed monitoring provides 1-minute CloudWatch metrics for each EC2 instance, allowing granular visibility into per-instance error rates.
Related concept
Detailed monitoring
- ✗
Enable VPC Flow Logs to capture traffic to each instance.
Why it's wrong here
VPC Flow Logs capture network traffic metadata (IPs, ports, protocols) and do not include application error metrics.
- ✗
Enable ALB access logs and store them in Amazon S3 for analysis.
Why it's wrong here
ALB access logs provide request-level data but are not real-time and require additional processing to correlate errors to specific instances.
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.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Detailed monitoring
- CloudWatch metrics granularity
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
Detailed monitoring
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review detailed monitoring, then practise related DOP-C02 questions on the same topic to reinforce the concept.
- →
Monitoring and Logging — study guide chapter
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Monitoring and Logging practice questions
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Monitoring and Logging — This question tests Monitoring and Logging — Detailed monitoring.
What is the correct answer to this question?
The correct answer is: Enable detailed monitoring on the EC2 instances to get 1-minute CloudWatch metrics. — Detailed monitoring on EC2 instances provides 1-minute CloudWatch metrics per instance, enabling granular visibility into individual instance performance, which is essential for identifying the root cause of increased error rates. Option A is incorrect because a CloudWatch dashboard aggregates metrics across all instances and does not provide per-instance granularity. Option C is incorrect because VPC Flow Logs capture network traffic metadata (source/destination IPs, ports, etc.) and not application error metrics. Option D is incorrect because ALB access logs provide request-level data but require additional analysis to extract per-instance error rates and are not real-time.
What should I do if I get this DOP-C02 question wrong?
Review detailed monitoring, then practise related DOP-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Detailed monitoring
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Last reviewed: Jun 20, 2026
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