- A
Update the ECS service to set the desired count of the new task set to zero.
Why wrong: This might remove the new task set, but does not manage traffic routing through CodeDeploy and may cause inconsistencies.
- B
Use the CodeDeploy console to stop the deployment and then choose to reroute traffic.
Correct. CodeDeploy allows you to stop the deployment and reroute traffic to the original task set.
- C
Delete the new task set.
Why wrong: Simply deleting the task set does not return traffic to the original; the listener rule still points to the new target group.
- D
Update the Application Load Balancer listener rule to forward traffic to the original target group.
Why wrong: This bypasses CodeDeploy's lifecycle hooks and is not the proper way to perform a controlled rollback.
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 deploying an application to Amazon ECS using AWS CodeDeploy with a blue/green deployment strategy. After the new task set is created, it fails health checks. The developer wants to immediately route traffic back to the original task set without waiting for CodeDeploy to complete the rollback process. Which action should the developer take?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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
Use the CodeDeploy console to stop the deployment and then choose to reroute traffic.
Option B is correct because CodeDeploy's blue/green deployments for ECS include a built-in 'Reroute traffic' option that allows you to immediately redirect traffic back to the original task set when a deployment fails health checks. This action bypasses the normal rollback process, which would wait for the deployment to complete or for the configured rollback triggers to fire, giving the developer instant control over traffic routing.
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.
- ✗
Update the ECS service to set the desired count of the new task set to zero.
Why it's wrong here
This might remove the new task set, but does not manage traffic routing through CodeDeploy and may cause inconsistencies.
- ✓
Use the CodeDeploy console to stop the deployment and then choose to reroute traffic.
Why this is correct
Correct. CodeDeploy allows you to stop the deployment and reroute traffic to the original task set.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Delete the new task set.
Why it's wrong here
Simply deleting the task set does not return traffic to the original; the listener rule still points to the new target group.
- ✗
Update the Application Load Balancer listener rule to forward traffic to the original target group.
Why it's wrong here
This bypasses CodeDeploy's lifecycle hooks and is not the proper way to perform a controlled rollback.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume deleting the new task set or scaling it to zero will automatically restore traffic, but they overlook that the ALB listener rule remains pointed at the new (now empty or deleted) target group, causing a complete outage until the listener is manually updated.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy manages ECS blue/green deployments by creating a new task set and a new target group, then updating the ALB listener to forward traffic to the new target group. The 'Reroute traffic' option in the CodeDeploy console triggers a deployment action that reverts the ALB listener rule to point back to the original target group, and then terminates the new task set, all within the deployment lifecycle without waiting for the full rollback timeout. This is critical in production scenarios where even a few seconds of downtime from a failed health check can impact SLAs, and the developer needs immediate traffic restoration without manual ALB edits.
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.
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: Use the CodeDeploy console to stop the deployment and then choose to reroute traffic. — Option B is correct because CodeDeploy's blue/green deployments for ECS include a built-in 'Reroute traffic' option that allows you to immediately redirect traffic back to the original task set when a deployment fails health checks. This action bypasses the normal rollback process, which would wait for the deployment to complete or for the configured rollback triggers to fire, giving the developer instant control over traffic routing.
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: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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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