- A
CodeDeployDefault.OneAtATime
This configuration deploys to exactly one instance at a time. It ensures minimal disruption because only one instance is removed from service during each deploy interval.
- B
CodeDeployDefault.HalfAtATime
Why wrong: This deploys to half the fleet at a time. During that time, half of the instances are offline, which could reduce overall capacity significantly.
- C
CodeDeployDefault.AllAtOnce
Why wrong: This deploys to all instances simultaneously, meaning all instances are replaced at once. This can cause complete downtime if not behind a load balancer with health checks.
- D
CodeDeployDefault.LambdaCanary10Percent5Minutes
Why wrong: This configuration is for AWS Lambda deployments, not for EC2/On-Premises compute platform. It shifts traffic gradually for Lambda functions.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. 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.
A developer is using AWS CodeDeploy to deploy an application to a fleet of EC2 instances in an Auto Scaling group. The application must remain available during the deployment. The developer wants to update one instance at a time, ensuring that only one instance is taken offline at any moment. Which deployment configuration should the developer choose?
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
CodeDeployDefault.OneAtATime
CodeDeployDefault.OneAtATime is the correct deployment configuration because it deploys the application to only one instance at a time, ensuring that the remaining instances continue to serve traffic. This matches the requirement to take only one instance offline at any moment, preserving high availability throughout the deployment.
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.
- ✓
CodeDeployDefault.OneAtATime
Why this is correct
This configuration deploys to exactly one instance at a time. It ensures minimal disruption because only one instance is removed from service during each deploy interval.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
CodeDeployDefault.HalfAtATime
Why it's wrong here
This deploys to half the fleet at a time. During that time, half of the instances are offline, which could reduce overall capacity significantly.
- ✗
CodeDeployDefault.AllAtOnce
Why it's wrong here
This deploys to all instances simultaneously, meaning all instances are replaced at once. This can cause complete downtime if not behind a load balancer with health checks.
- ✗
CodeDeployDefault.LambdaCanary10Percent5Minutes
Why it's wrong here
This configuration is for AWS Lambda deployments, not for EC2/On-Premises compute platform. It shifts traffic gradually for Lambda functions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'one at a time' with 'half at a time' or 'all at once' due to misreading the requirement for minimal disruption, or they may incorrectly apply a Lambda-specific configuration to an EC2 deployment.
Detailed technical explanation
How to think about this question
CodeDeployDefault.OneAtATime is a predefined deployment configuration that sets the minimum healthy instance count to 0 and the maximum healthy instance count to 100% of the fleet size minus 1, effectively allowing only one instance to be updated at a time. Under the hood, CodeDeploy uses the Auto Scaling group's lifecycle hooks to register and deregister instances from the load balancer, ensuring traffic is shifted away from the instance being updated. In a real-world scenario, this configuration is ideal for critical production workloads where even brief multi-instance downtime is unacceptable, such as a payment processing service.
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
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.
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: CodeDeployDefault.OneAtATime — CodeDeployDefault.OneAtATime is the correct deployment configuration because it deploys the application to only one instance at a time, ensuring that the remaining instances continue to serve traffic. This matches the requirement to take only one instance offline at any moment, preserving high availability throughout the deployment.
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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