The answer is to enable detailed CloudWatch metrics on the ALB and analyze the ALB access logs, as this approach provides granular latency data without any impact on live traffic. Detailed CloudWatch metrics break down latency by target group and request path, while access logs capture per-request timing fields like request_processing_time and target_processing_time, allowing you to isolate whether the bottleneck is at the load balancer, the target, or the network. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your ability to choose a non-invasive, data-driven troubleshooting method that leverages existing observability tools rather than disrupting production—a common trap is reaching for SSH or packet capture, which either lacks historical context or risks performance degradation. Remember the memory tip: "Logs and metrics, no scripts or gimmicks" to avoid the pitfalls of direct server access or test environment duplication.
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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.
A company runs a production web application on EC2 instances behind an Application Load Balancer. The application experiences intermittent high latency. The operations team needs to identify the root cause without affecting live traffic. Which approach is the MOST efficient?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable detailed CloudWatch metrics on the ALB and analyze ALB access logs
Using detailed CloudWatch metrics and access logs from the ALB allows analyzing request latency patterns without impacting production traffic. Option A is wrong because SSH access may be restricted and cannot provide historical data. Option C is wrong because it requires creating a separate test environment. Option D is wrong because tcpdump generates large volumes of data and can impact performance.
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.
✗
Deploy a separate test environment with identical configuration and run load tests
Why it's wrong here
Creating a test environment takes time and may not reproduce production conditions.
✗
Enable EC2 detailed monitoring and SSH into each instance to run top and iostat
Why it's wrong here
SSH access may be restricted and cannot provide historical latency data.
✓
Enable detailed CloudWatch metrics on the ALB and analyze ALB access logs
Why this is correct
ALB metrics and logs provide request-level latency without impacting production.
Related concept
Static NAT maps one inside address to one outside address.
✗
Run tcpdump on all EC2 instances and analyze packet captures
Why it's wrong here
tcpdump can impact instance performance and generates large data volumes.
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 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.
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.
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable detailed CloudWatch metrics on the ALB and analyze ALB access logs — Using detailed CloudWatch metrics and access logs from the ALB allows analyzing request latency patterns without impacting production traffic. Option A is wrong because SSH access may be restricted and cannot provide historical data. Option C is wrong because it requires creating a separate test environment. Option D is wrong because tcpdump generates large volumes of data and can impact performance.
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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