- A
Enable AWS CloudTrail for all accounts and regions.
Why wrong: CloudTrail records API calls, not application or system logs.
- B
Configure all services to send logs to Amazon S3 and use Amazon Athena for ad-hoc querying.
S3 can serve as a central log repository, and Athena can query logs across tiers using SQL.
- C
Use AWS Config rules to monitor configuration changes across resources.
Why wrong: AWS Config monitors resource configurations, not logs.
- D
Enable VPC Flow Logs to capture network traffic.
Why wrong: VPC Flow Logs capture IP traffic metadata, not application or system logs.
- E
Deploy the unified CloudWatch agent on all EC2 instances to collect system and application logs.
The unified CloudWatch agent can collect logs from EC2 instances and send them to CloudWatch Logs for centralized access.
Quick Answer
The correct answer is to deploy the unified CloudWatch agent on all EC2 instances and send all logs to Amazon S3 for querying with Athena. The unified CloudWatch agent is purpose-built to collect both system metrics and application logs from EC2 instances, forwarding them to CloudWatch Logs for centralized analysis across your multi-tier AWS application. Pairing this with S3 and Athena gives you a cost-effective, queryable log archive that scales independently of compute resources. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your ability to distinguish between logging services and configuration tools—common traps include confusing CloudTrail (API activity only) or AWS Config (resource changes) with actual application log collection. Remember the memory tip: "Logs go to Logs or S3, not to Trails or Config." This reinforces that centralized logging for multi-tier applications requires agents or direct shipping to log storage, not audit or compliance services.
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 team is designing a monitoring solution for a multi-tier web application running on AWS. The application consists of an Application Load Balancer, EC2 instances in an Auto Scaling group, and an RDS database. Which TWO approaches provide centralized logging and monitoring across all tiers?
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
Configure all services to send logs to Amazon S3 and use Amazon Athena for ad-hoc querying.
Options B and D are correct. Option B: The unified CloudWatch agent can collect logs from EC2 instances and send them to CloudWatch Logs, enabling centralized log analysis. Option D: Sending all logs to Amazon S3 and using Amazon Athena to query them provides a cost-effective centralized solution. Option A is wrong because CloudTrail only records API activity, not application logs. Option C is wrong because AWS Config focuses on resource configuration changes, not operational logs. Option E is wrong because VPC Flow Logs only capture network traffic metadata, not application logs.
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.
- ✗
Enable AWS CloudTrail for all accounts and regions.
Why it's wrong here
CloudTrail records API calls, not application or system logs.
- ✓
Configure all services to send logs to Amazon S3 and use Amazon Athena for ad-hoc querying.
Why this is correct
S3 can serve as a central log repository, and Athena can query logs across tiers using SQL.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS Config rules to monitor configuration changes across resources.
Why it's wrong here
AWS Config monitors resource configurations, not logs.
- ✗
Enable VPC Flow Logs to capture network traffic.
Why it's wrong here
VPC Flow Logs capture IP traffic metadata, not application or system logs.
- ✓
Deploy the unified CloudWatch agent on all EC2 instances to collect system and application logs.
Why this is correct
The unified CloudWatch agent can collect logs from EC2 instances and send them to CloudWatch Logs for centralized access.
Related concept
Read the scenario before looking for a memorised answer.
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
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure all services to send logs to Amazon S3 and use Amazon Athena for ad-hoc querying. — Options B and D are correct. Option B: The unified CloudWatch agent can collect logs from EC2 instances and send them to CloudWatch Logs, enabling centralized log analysis. Option D: Sending all logs to Amazon S3 and using Amazon Athena to query them provides a cost-effective centralized solution. Option A is wrong because CloudTrail only records API activity, not application logs. Option C is wrong because AWS Config focuses on resource configuration changes, not operational logs. Option E is wrong because VPC Flow Logs only capture network traffic metadata, not application logs.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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