- A
Add an invoke action that calls a Lambda function to check the image.
Why wrong: Adding an invoke action that calls a Lambda function could potentially check the image, but it requires custom development and is less straightforward than simply adding a test stage with a script. Therefore, while it might work, option C is a simpler and more direct solution.
- B
Add a manual approval step before the deploy stage.
Why wrong: A manual approval step requires human intervention and does not automatically catch the error. It would only pause the pipeline until someone manually approves, but it doesn't validate the image existence.
- C
Add a test stage that runs a script to verify the image exists in ECR.
Adding a test stage after the build that runs a script to verify the image exists in ECR directly catches the error before deployment, making it the correct and most efficient solution.
- D
Add a second build stage that re-builds the image.
Why wrong: Adding a second build stage would rebuild the image unnecessarily and does not validate that the existing image exists in ECR. It does not solve the problem.
DOP-C02 CodePipeline Stages Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: codePipeline Stages. 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 for CI/CD. A recent deployment to an Amazon ECS service failed because the new task definition referenced an ECR image that does not exist. The pipeline uses a source stage (CodeCommit), build stage (CodeBuild), and deploy stage (ECS). The engineer wants to catch such errors earlier. What should the engineer add to the pipeline?
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
Add a test stage that runs a script to verify the image exists in ECR.
Option C is correct because adding a test stage after the build stage that runs a script to verify the image exists in ECR would catch the error before deployment. Option A is wrong because while an invoke action with Lambda could check the image, it requires custom development and is less straightforward than a simple test stage. Option B is wrong because a manual approval step requires human intervention and does not automatically catch the error. Option D is wrong because a second build stage would rebuild the image unnecessarily and does not validate the existing image.
Key principle: CodePipeline Stages
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add an invoke action that calls a Lambda function to check the image.
Why it's wrong here
Adding an invoke action that calls a Lambda function could potentially check the image, but it requires custom development and is less straightforward than simply adding a test stage with a script. Therefore, while it might work, option C is a simpler and more direct solution.
- ✗
Add a manual approval step before the deploy stage.
Why it's wrong here
A manual approval step requires human intervention and does not automatically catch the error. It would only pause the pipeline until someone manually approves, but it doesn't validate the image existence.
- ✓
Add a test stage that runs a script to verify the image exists in ECR.
Why this is correct
Adding a test stage after the build that runs a script to verify the image exists in ECR directly catches the error before deployment, making it the correct and most efficient solution.
Related concept
CodePipeline Stages
- ✗
Add a second build stage that re-builds the image.
Why it's wrong here
Adding a second build stage would rebuild the image unnecessarily and does not validate that the existing image exists in ECR. It does not solve the problem.
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
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- CodePipeline Stages
- Pre-deployment Validation
- Test Stage
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
CodePipeline Stages
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. CodePipeline Stages Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Review codePipeline Stages, then practise related DOP-C02 questions on the same topic to reinforce the concept.
- →
Incident and Event Response — study guide chapter
Learn the concepts, then practise the questions
- →
Incident and Event Response practice questions
Targeted practice on this topic area only
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AWS Certified DevOps Engineer Professional DOP-C02 study guide
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DOP-C02 practice test guide
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Incident and Event Response — This question tests Incident and Event Response — CodePipeline Stages.
What is the correct answer to this question?
The correct answer is: Add a test stage that runs a script to verify the image exists in ECR. — Option C is correct because adding a test stage after the build stage that runs a script to verify the image exists in ECR would catch the error before deployment. Option A is wrong because while an invoke action with Lambda could check the image, it requires custom development and is less straightforward than a simple test stage. Option B is wrong because a manual approval step requires human intervention and does not automatically catch the error. Option D is wrong because a second build stage would rebuild the image unnecessarily and does not validate the existing image.
What should I do if I get this DOP-C02 question wrong?
Review codePipeline Stages, then practise related DOP-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
CodePipeline Stages
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Last reviewed: Jun 20, 2026
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