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. A key principle to apply: codeDeployDefault.HalfAtATime updates 50% of instances in a deployment group at once.. 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 an EC2 Auto Scaling group. The deployment must follow a rolling update, deploying to exactly 50% of the instances at a time. Which built-in deployment configuration should the developer use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
CodeDeployDefault.HalfAtATime
Option B, CodeDeployDefault.HalfAtATime, is correct because it instructs CodeDeploy to deploy to exactly 50% of the instances in the Auto Scaling group at a time during a rolling update. This built-in configuration ensures that half the instances are updated before the other half, matching the requirement for a 50% rolling deployment.
Key principle: CodeDeployDefault.HalfAtATime updates 50% of instances in a deployment group at once.
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 it's wrong here
This deploys to one instance at a time, not 50%.
✓
CodeDeployDefault.HalfAtATime
Why this is correct
This is the built-in configuration that deploys to half of the instances at a time during a rolling update.
Related concept
CodeDeployDefault.HalfAtATime updates 50% of instances in a deployment group at once.
✗
CodeDeployDefault.AllAtOnce
Why it's wrong here
This deploys to all instances simultaneously, which does not meet the rolling update requirement.
✗
CodeDeployDefault.LambdaAllAtOnce
Why it's wrong here
This is for Lambda deployments, not EC2 instances.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse CodeDeployDefault.HalfAtATime with CodeDeployDefault.OneAtATime or CodeDeployDefault.AllAtOnce, or incorrectly apply Lambda-specific configurations like CodeDeployDefault.LambdaAllAtOnce to EC2 deployments.
Detailed technical explanation
How to think about this question
CodeDeploy's built-in deployment configurations for EC2/on-premises compute platforms define the number of instances to deploy to in parallel. CodeDeployDefault.HalfAtATime uses a 'half' size, calculated as 50% of the instances in the Auto Scaling group, and waits for a successful deployment to that batch before proceeding to the next. This configuration is ideal for maintaining availability during updates, as it ensures half the instances remain serving traffic while the other half is updated.
KKey Concepts to Remember
CodeDeployDefault.HalfAtATime updates 50% of instances in a deployment group at once.
It's a built-in deployment configuration for EC2/on-premises compute platforms.
This configuration ensures high availability during rolling updates.
It's suitable when balancing deployment speed with minimal service interruption.
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
CodeDeployDefault.HalfAtATime updates 50% of instances in a deployment group at once.
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. CodeDeployDefault.HalfAtATime updates 50% of instances in a deployment group at once. 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.
Review codeDeployDefault.HalfAtATime updates 50% of instances in a deployment group at once., then practise related DVA-C02 questions on the same topic to reinforce the concept.
Deployment — This question tests Deployment — CodeDeployDefault.HalfAtATime updates 50% of instances in a deployment group at once..
What is the correct answer to this question?
The correct answer is: CodeDeployDefault.HalfAtATime — Option B, CodeDeployDefault.HalfAtATime, is correct because it instructs CodeDeploy to deploy to exactly 50% of the instances in the Auto Scaling group at a time during a rolling update. This built-in configuration ensures that half the instances are updated before the other half, matching the requirement for a 50% rolling deployment.
What should I do if I get this DVA-C02 question wrong?
Review codeDeployDefault.HalfAtATime updates 50% of instances in a deployment group at once., then practise related DVA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
CodeDeployDefault.HalfAtATime updates 50% of instances in a deployment group at once.
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Question Discussion
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