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 wants to deploy a new version of an application to an EC2 Auto Scaling group using AWS CodeDeploy. The developer wants to minimize downtime and ensure that if the deployment fails, it automatically rolls back to the previous version. Which deployment type should the developer choose?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Blue/green
Blue/green deployment is the correct choice because it creates a separate, new Auto Scaling group (green) alongside the existing one (blue), allowing traffic to be shifted to the new environment after validation. This minimizes downtime by keeping the old environment fully operational during the deployment, and CodeDeploy can automatically roll back by redirecting traffic to the blue environment if the deployment fails.
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.
✗
In-place
Why it's wrong here
In-place deployments update instances gradually, potentially causing downtime and making rollback more complex.
✓
Blue/green
Why this is correct
Blue/green deployments minimize downtime by routing traffic to a new set of instances and allow easy rollback by reverting traffic.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Canary
Why it's wrong here
Canary is a deployment configuration for AWS Lambda, not for EC2 Auto Scaling groups.
✗
Linear
Why it's wrong here
Linear is a deployment configuration for AWS Lambda, not for EC2 Auto Scaling groups.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse deployment types across compute platforms, mistakenly applying canary or linear (which are valid for Lambda/ECS) to EC2 Auto Scaling groups, where only in-place or blue/green are supported by CodeDeploy.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy blue/green for EC2 Auto Scaling groups creates a new Auto Scaling group with the desired capacity, registers it with the load balancer, and then shifts traffic using the ELB's target group routing. The automatic rollback is triggered by deployment failure events (e.g., instance health checks failing or hook script errors) and reverts traffic to the original blue environment, ensuring zero downtime during the rollback process.
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.
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: Blue/green — Blue/green deployment is the correct choice because it creates a separate, new Auto Scaling group (green) alongside the existing one (blue), allowing traffic to be shifted to the new environment after validation. This minimizes downtime by keeping the old environment fully operational during the deployment, and CodeDeploy can automatically roll back by redirecting traffic to the blue environment if the deployment fails.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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