The correct answer is to enable ALB access logs, detailed CloudWatch metrics, and the CloudWatch agent on EC2 instances. This trio provides comprehensive visibility into application performance because access logs capture request-level details like latency and error codes per target, while detailed CloudWatch metrics such as RequestCount and TargetResponseTime offer aggregated performance data, and the CloudWatch agent streams application-level logs from the instances themselves. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your ability to distinguish between monitoring layers: VPC Flow Logs (network traffic) and CloudTrail (API auditing) are common traps that do not address application performance. Remember that ALB monitoring strategy requires three distinct sources—load balancer logs, load balancer metrics, and instance logs—to cover the full path from client to application. A useful memory tip is “Logs, Metrics, Agent” for the three pillars of ALB observability.
DOP-C02 Monitoring and Logging 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. 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 is running a critical application on Amazon EC2 instances behind an Application Load Balancer (ALB). They need to implement a monitoring strategy that provides detailed visibility into application performance, including request-level latency and error codes. Which THREE actions should they take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable ALB access logs and store them in Amazon S3.
Correct: A (Enable ALB access logs), C (Enable detailed CloudWatch metrics for the ALB), and D (Enable CloudWatch agent on EC2 instances for application logs). Option B is wrong because VPC Flow Logs are for network traffic, not application performance. Option E is wrong because CloudTrail is for API calls, not application metrics.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 VPC Flow Logs to capture traffic patterns.
Why it's wrong here
VPC Flow Logs provide network-level information, not application-level.
✓
Enable ALB access logs and store them in Amazon S3.
Why this is correct
Access logs contain request-level details including latency and error codes.
Related concept
Static NAT maps one inside address to one outside address.
✓
Install the CloudWatch agent on EC2 instances to collect application logs and custom metrics.
Why this is correct
Application logs can reveal errors and performance issues.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable AWS CloudTrail to log API calls made to the load balancer.
Why it's wrong here
CloudTrail logs management events, not application-level metrics.
✓
Enable detailed CloudWatch metrics for the ALB (e.g., RequestCount, TargetResponseTime).
Why this is correct
Detailed metrics provide per-instance and per-target group latency.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
Monitoring and Logging — This question tests Monitoring and Logging — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable ALB access logs and store them in Amazon S3. — Correct: A (Enable ALB access logs), C (Enable detailed CloudWatch metrics for the ALB), and D (Enable CloudWatch agent on EC2 instances for application logs). Option B is wrong because VPC Flow Logs are for network traffic, not application performance. Option E is wrong because CloudTrail is for API calls, not application metrics.
What should I do if I get this DOP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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