- A
Deployment type: blue/green, with rollback configuration enabled to trigger automatic rollback and reroute traffic to the original task set
Correct. This configuration ensures that if the new task set fails, CodeDeploy rolls back to the previous version.
- B
Deployment type: blue/green, Deployment configuration: CodeDeployDefault.ECSAllAtOnce
Why wrong: This shifts all traffic at once and does not include automatic rollback on health check failure.
- C
Deployment type: blue/green, Deployment configuration: CodeDeployDefault.ECSLinear10PercentEvery1Minutes
Why wrong: This shifts traffic incrementally but does not enable automatic rollback.
- D
Deployment type: blue/green, with an Application Load Balancer
Why wrong: An ALB is typically required for blue/green on ECS, but it does not automatically provide rollback behavior.
Quick Answer
The answer is to configure the deployment group with a blue/green deployment type and enable automatic rollback, specifically setting the rollback trigger to fire on deployment failure or health check failure. This is correct because CodeDeploy’s blue/green deployment for ECS Fargate creates a new green task set, shifts traffic gradually, and only terminates the blue task set after the green set passes all configured health checks. If the green set fails, the automatic rollback configuration instructs CodeDeploy to immediately reroute traffic back to the original blue task set and terminate the green deployment, ensuring zero downtime. On the DVA-C02 exam, this scenario tests your understanding of how CodeDeploy integrates with ECS and Fargate for safe deployments, and a common trap is confusing rollback with simply stopping the deployment—automatic rollback actively restores the previous state. Remember the mnemonic “Green fails, Blue sails” to recall that auto rollback sends traffic back to the original task set.
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 developer is using AWS CodeDeploy with a blue/green deployment on an Amazon ECS service running on Fargate. The developer wants to ensure that the new (green) task set is fully healthy and serving traffic before the old (blue) task set is terminated. The deployment should automatically roll back to the blue task set if the green task set fails health checks. Which configuration should the developer set in the CodeDeploy deployment group?
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
Deployment type: blue/green, with rollback configuration enabled to trigger automatic rollback and reroute traffic to the original task set
Option A is correct because the developer needs to configure the CodeDeploy deployment group with a blue/green deployment type and enable automatic rollback. This ensures that if the green task set fails health checks, CodeDeploy automatically terminates the green deployment and reroutes traffic back to the original blue task set, meeting the requirement for a fully healthy green task set before termination.
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.
- ✓
Deployment type: blue/green, with rollback configuration enabled to trigger automatic rollback and reroute traffic to the original task set
Why this is correct
Correct. This configuration ensures that if the new task set fails, CodeDeploy rolls back to the previous version.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Deployment type: blue/green, Deployment configuration: CodeDeployDefault.ECSAllAtOnce
Why it's wrong here
This shifts all traffic at once and does not include automatic rollback on health check failure.
- ✗
Deployment type: blue/green, Deployment configuration: CodeDeployDefault.ECSLinear10PercentEvery1Minutes
Why it's wrong here
This shifts traffic incrementally but does not enable automatic rollback.
- ✗
Deployment type: blue/green, with an Application Load Balancer
Why it's wrong here
An ALB is typically required for blue/green on ECS, but it does not automatically provide rollback behavior.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse deployment configurations (like AllAtOnce or Linear) with rollback settings, assuming that a traffic shifting strategy alone ensures health checks and automatic rollback, but rollback must be explicitly configured in the deployment group.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy uses the ECS service's task set management to orchestrate blue/green deployments. When automatic rollback is enabled, CodeDeploy monitors the green task set's health via the ALB target group health checks; if the green task set fails, CodeDeploy triggers a rollback by updating the ECS service to use the original blue task set and terminates the green task set. This behavior is controlled by the deployment group's rollback configuration, which can be set to trigger on deployment failure or alarm-based conditions.
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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
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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: Deployment type: blue/green, with rollback configuration enabled to trigger automatic rollback and reroute traffic to the original task set — Option A is correct because the developer needs to configure the CodeDeploy deployment group with a blue/green deployment type and enable automatic rollback. This ensures that if the green task set fails health checks, CodeDeploy automatically terminates the green deployment and reroutes traffic back to the original blue task set, meeting the requirement for a fully healthy green task set before termination.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 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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