The answer is to check the CodeDeploy deployment logs and verify the target group’s health check configuration. These two steps directly address the root cause of a CodeDeploy health check failure: the logs reveal the specific error from the deployment agent, while the target group configuration ensures the load balancer’s health check path, port, and response timeout match the application’s actual endpoint. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of the deployment lifecycle and the distinction between build-stage logs (CodeBuild) and deploy-stage diagnostics (CodeDeploy). A common trap is to waste time inspecting CodeBuild logs or scaling instances, but health checks are purely a post-deployment validation issue. Remember the mnemonic “Logs then Load” — always start with the deployment logs to pinpoint the error, then verify the load balancer’s health check settings to confirm the application is reachable.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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 is using AWS CodePipeline for CI/CD. The pipeline has a build stage using AWS CodeBuild, and a deploy stage using AWS CodeDeploy. The deployment is failing with 'Error: Health checks failed'. Which TWO steps should the developer take to troubleshoot this issue? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify that the target group's health check path and port are correctly configured.
Options B and D are correct. Checking the CodeDeploy deployment logs (B) will show detailed error messages. Verifying the target group's health check configuration (D) ensures the application is responding correctly. Option A (checking CodeBuild logs) is irrelevant because the build stage succeeded. Option C (increasing instance count) does not address health check failure. Option E (checking S3 bucket) is not directly related.
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.
✓
Verify that the target group's health check path and port are correctly configured.
Why this is correct
Misconfigured health checks are a common cause of deployment failures.
Related concept
Static NAT maps one inside address to one outside address.
✗
Check the S3 bucket where the build artifacts are stored.
Why it's wrong here
The artifacts are already downloaded; the issue is with the application's health.
✓
Check the CodeDeploy deployment logs for detailed error messages.
Why this is correct
CodeDeploy logs provide specific reasons for health check failures.
Related concept
Static NAT maps one inside address to one outside address.
✗
Check the CodeBuild build logs for errors.
Why it's wrong here
The build stage is successful; the error is in the deploy stage.
✗
Increase the number of EC2 instances in the Auto Scaling group.
Why it's wrong here
Increasing instances does not fix health check failures.
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 DVA-C02 NAT questions on configuration and troubleshooting.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Verify that the target group's health check path and port are correctly configured. — Options B and D are correct. Checking the CodeDeploy deployment logs (B) will show detailed error messages. Verifying the target group's health check configuration (D) ensures the application is responding correctly. Option A (checking CodeBuild logs) is irrelevant because the build stage succeeded. Option C (increasing instance count) does not address health check failure. Option E (checking S3 bucket) is not directly related.
What should I do if I get this DVA-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 DVA-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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