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 company uses AWS CodePipeline to deploy a containerized application to Amazon ECS with Fargate. The pipeline consists of a source stage (Amazon ECR), a build stage (CodeBuild), and a deploy stage (CodeDeploy with ECS Blue/Green). Recently, after a successful build, the deploy stage fails with the error 'Service deployment failed because the task definition is not compatible with the target group.' The task definition uses the 'awsvpc' network mode and specifies a port mapping of 80. The target group is configured to use port 80. What is the MOST likely cause of the failure?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The target group health check path is not configured correctly.
The error 'Service deployment failed because the task definition is not compatible with the target group' typically occurs when the target group's health check configuration is invalid or unreachable. In an ECS Blue/Green deployment with CodeDeploy, the target group health check path must be configured to return a valid HTTP response from the container; if the path is incorrect (e.g., missing or pointing to a non-existent endpoint), the target group marks instances as unhealthy, causing the deployment to fail even though the port mapping and network mode are correct.
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 task definition port mapping does not match the target group port.
Why it's wrong here
Both are port 80.
✗
The task definition does not include a logging configuration for CloudWatch Logs.
Why it's wrong here
Logging is not required for deployment compatibility.
✗
The task definition uses the 'awsvpc' network mode, which is not supported for Blue/Green deployments.
Why it's wrong here
awsvpc is required for Fargate.
✓
The target group health check path is not configured correctly.
Why this is correct
Health check failures cause deployment failure.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the error is about port mismatches or network mode restrictions, but the real issue is the health check path configuration, which is a subtle but common cause of deployment failures in Blue/Green deployments.
Detailed technical explanation
How to think about this question
CodeDeploy's ECS Blue/Green deployment uses an 'original' and 'replacement' target group; the health check settings (protocol, port, path, interval, threshold) are evaluated during the 'AllowTraffic' hook. If the health check path returns a non-2xx/3xx status code or times out, the target group considers the task unhealthy, and CodeDeploy fails the deployment. Common misconfigurations include using a path like '/' when the application serves on '/health' or not configuring a web server to respond on the specified port.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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.
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 target group health check path is not configured correctly. — The error 'Service deployment failed because the task definition is not compatible with the target group' typically occurs when the target group's health check configuration is invalid or unreachable. In an ECS Blue/Green deployment with CodeDeploy, the target group health check path must be configured to return a valid HTTP response from the container; if the path is incorrect (e.g., missing or pointing to a non-existent endpoint), the target group marks instances as unhealthy, causing the deployment to fail even though the port mapping and network mode are correct.
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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Question Discussion
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