- A
The CodeDeploy deployment group's compute platform is set to 'Lambda' instead of 'ECS'.
Incorrect compute platform causes deployment failure.
- B
The manual approval step changed the task definition ARN to a previous version.
Why wrong: Manual approval does not modify the task definition.
- C
The ECR repository has a lifecycle policy that expired the image tag before deployment.
Why wrong: The image was just pushed; lifecycle policies typically take time to act.
- D
The CodePipeline is not configured to use the CodeDeploy provider for ECS.
Why wrong: The pipeline uses CodeDeploy as stated.
Question 1,158 of 1,750
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
You are a DevOps engineer for a company that runs a containerized microservices application on Amazon ECS with Fargate. The CI/CD pipeline uses AWS CodePipeline, with CodeBuild for building Docker images and pushing them to Amazon ECR, and CodeDeploy for deploying to ECS. The pipeline has a manual approval step before production deployment. Recently, the production deployment failed after approval, with the error: 'The service my-service could not be deployed because the task definition arn:aws:ecs:us-east-1:123456789012:task-definition/my-task:5 references an image that does not exist in the repository.' The image was built and pushed successfully in the Build stage. The task definition is updated by CodeDeploy to reference the new image URI. The ECS service is configured with 'deploymentController: CODE_DEPLOY' and uses a blue/green deployment. The CodeDeploy deployment group uses a 'Lambda' compute platform (incorrectly set). The pipeline uses the default CodeDeploy provider for ECS. 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 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 CodeDeploy deployment group's compute platform is set to 'Lambda' instead of 'ECS'.
The correct answer is A. CodeDeploy for ECS requires the compute platform to be 'ECS' (or 'Server' for EC2), not 'Lambda'. Setting it to 'Lambda' causes the deployment to fail because CodeDeploy then expects a Lambda function instead of an ECS service, leading to the error that the task definition references a non-existent image. Option B is incorrect because the manual approval step does not change the task definition ARN. Option C is incorrect because the image was built and pushed successfully, and no lifecycle policy expired it. Option D is incorrect because the pipeline is configured to use the CodeDeploy provider for ECS (the default provider).
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 CodeDeploy deployment group's compute platform is set to 'Lambda' instead of 'ECS'.
Why this is correct
Incorrect compute platform causes 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.
- ✗
The manual approval step changed the task definition ARN to a previous version.
Why it's wrong here
Manual approval does not modify the task definition.
- ✗
The ECR repository has a lifecycle policy that expired the image tag before deployment.
Why it's wrong here
The image was just pushed; lifecycle policies typically take time to act.
- ✗
The CodePipeline is not configured to use the CodeDeploy provider for ECS.
Why it's wrong here
The pipeline uses CodeDeploy as stated.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The CodeDeploy deployment group's compute platform is set to 'Lambda' instead of 'ECS'. — The correct answer is A. CodeDeploy for ECS requires the compute platform to be 'ECS' (or 'Server' for EC2), not 'Lambda'. Setting it to 'Lambda' causes the deployment to fail because CodeDeploy then expects a Lambda function instead of an ECS service, leading to the error that the task definition references a non-existent image. Option B is incorrect because the manual approval step does not change the task definition ARN. Option C is incorrect because the image was built and pushed successfully, and no lifecycle policy expired it. Option D is incorrect because the pipeline is configured to use the CodeDeploy provider for ECS (the default provider).
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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.
About these practice questions
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Last reviewed: Jun 20, 2026
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