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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. A key principle to apply: codeDeployDefault.OneAtATime updates one instance at a time in a deployment group.. 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 Auto Scaling group of EC2 instances. The application is critical and must have zero downtime. The Auto Scaling group currently has 4 instances spread across 2 Availability Zones. Which predefined deployment configuration minimizes the number of instances taken out of service at any given time?

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

Option C, CodeDeployDefault.OneAtATime, is correct because it deploys the application to only one instance at a time, ensuring that the remaining instances continue to serve traffic. This minimizes the number of instances taken out of service at any given moment, which is critical for achieving zero downtime in an Auto Scaling group with 4 instances across 2 Availability Zones.

Key principle: CodeDeployDefault.OneAtATime updates one instance at a time in a deployment group.

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.AllAtOnce

    Why it's wrong here

    AllAtOnce deploys to all instances simultaneously, taking the entire fleet out of service and causing downtime.

  • ✗

    CodeDeployDefault.HalfAtATime

    Why it's wrong here

    HalfAtATime deploys to half (2) of the instances at a time, which still takes a significant portion of capacity out.

  • ✓

    CodeDeployDefault.OneAtATime

    Why this is correct

    OneAtATime deploys to a single instance at a time, minimizing the number of instances offline and best preserving availability.

    Related concept

    CodeDeployDefault.OneAtATime updates one instance at a time in a deployment group.

  • ✗

    CodeDeployDefault.LambdaCanary10Percent5Minutes

    Why it's wrong here

    This configuration is designed for Lambda functions, not EC2 instances, and is not applicable here.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may confuse deployment configurations designed for EC2 instances (like OneAtATime) with those for Lambda (like LambdaCanary10Percent5Minutes), or incorrectly assume HalfAtATime is the safest option without considering that OneAtATime minimizes the number of instances out of service even further.

Detailed technical explanation

How to think about this question

CodeDeploy's predefined deployment configurations for EC2/on-premises compute platforms control the traffic shifting and instance batch size. OneAtATime uses a batch size of 1, meaning only one instance is stopped, updated, and re-registered with the load balancer before proceeding to the next. This approach is ideal for stateful applications or when maintaining full capacity during deployment is critical, as it keeps 75% of instances serving traffic at all times in a 4-instance group.

KKey Concepts to Remember

  • CodeDeployDefault.OneAtATime updates one instance at a time in a deployment group.
  • It is ideal for minimizing downtime and maintaining high availability during deployments.
  • This configuration ensures a minimal reduction in application capacity during updates.
  • It is suitable for critical applications where service interruption must be avoided.

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.OneAtATime updates one instance at a time in a deployment group.

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.

Review codeDeployDefault.OneAtATime updates one instance at a time in a deployment group., then practise related DVA-C02 questions on the same topic to reinforce the concept.

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FAQ

Questions learners often ask

What does this DVA-C02 question test?

Deployment — This question tests Deployment — CodeDeployDefault.OneAtATime updates one instance at a time in a deployment group..

What is the correct answer to this question?

The correct answer is: CodeDeployDefault.OneAtATime — Option C, CodeDeployDefault.OneAtATime, is correct because it deploys the application to only one instance at a time, ensuring that the remaining instances continue to serve traffic. This minimizes the number of instances taken out of service at any given moment, which is critical for achieving zero downtime in an Auto Scaling group with 4 instances across 2 Availability Zones.

What should I do if I get this DVA-C02 question wrong?

Review codeDeployDefault.OneAtATime updates one instance at a time in a deployment group., then practise related DVA-C02 questions on the same topic to reinforce the concept.

What is the key concept behind this question?

CodeDeployDefault.OneAtATime updates one instance at a time in a deployment group.

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Last reviewed: Jun 11, 2026

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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.