- A
The ALB target group health check is misconfigured or the application is not responding to health check requests.
CodeDeploy uses ALB health checks to validate instance health; a failing health check causes the deployment to fail.
- B
The EC2 instances do not have the correct IAM instance profile attached.
Why wrong: Missing IAM role would cause authorization failure, not health check error.
- C
The deployment configuration is set to 'AllAtOnce' which does not support health checks.
Why wrong: AllAtOnce still performs health checks; health check failure can still occur.
- D
The deployment group is not configured with the ALB target group.
Why wrong: If not configured, deployment would proceed but instances would not be registered with ALB; health check error would not occur.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. 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 development team is using AWS CodeDeploy to deploy a web application to an Auto Scaling group. The deployment fails with a 'HealthCheck' error. The application runs on Amazon EC2 instances behind an Application Load Balancer (ALB). What is the MOST likely cause of this error?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
The ALB target group health check is misconfigured or the application is not responding to health check requests.
The 'HealthCheck' error in AWS CodeDeploy indicates that the deployment failed because the target group health checks are not passing. This typically occurs when the ALB health check path or configuration does not match the application's expected response, or the application is not running correctly on the instances, causing the ALB to mark them as unhealthy. CodeDeploy monitors the ALB target group health status during deployment and will fail if instances do not become healthy within the configured timeout.
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.
- ✓
The ALB target group health check is misconfigured or the application is not responding to health check requests.
Why this is correct
CodeDeploy uses ALB health checks to validate instance health; a failing health check causes the deployment to fail.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The EC2 instances do not have the correct IAM instance profile attached.
Why it's wrong here
Missing IAM role would cause authorization failure, not health check error.
- ✗
The deployment configuration is set to 'AllAtOnce' which does not support health checks.
Why it's wrong here
AllAtOnce still performs health checks; health check failure can still occur.
- ✗
The deployment group is not configured with the ALB target group.
Why it's wrong here
If not configured, deployment would proceed but instances would not be registered with ALB; health check error would not occur.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a 'HealthCheck' error with a permissions or configuration issue, but the error specifically points to the ALB health check failing, not to IAM roles or deployment group setup.
Detailed technical explanation
How to think about this question
CodeDeploy uses the ALB target group's health check settings (protocol, port, path, interval, threshold) to determine instance health. The default health check path is '/' over HTTP, and if the application does not respond with a 200 OK status within the healthy threshold count, the instance is marked unhealthy. A common real-world scenario is when the application's health endpoint returns a non-200 status (e.g., 302 redirect or 500 error) or the path is case-sensitive and mismatched, causing the deployment to fail even though the application appears to be running.
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.
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
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The ALB target group health check is misconfigured or the application is not responding to health check requests. — The 'HealthCheck' error in AWS CodeDeploy indicates that the deployment failed because the target group health checks are not passing. This typically occurs when the ALB health check path or configuration does not match the application's expected response, or the application is not running correctly on the instances, causing the ALB to mark them as unhealthy. CodeDeploy monitors the ALB target group health status during deployment and will fail if instances do not become healthy within the configured timeout.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
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