- A
Set the 'IgnoreApplicationStopFailures' flag to true.
Why wrong: This ignores errors during the ApplicationStop lifecycle event, which could cause issues.
- B
Configure a load balancer for the Auto Scaling group.
A load balancer can drain connections and reroute traffic.
- C
Use an 'AllAtOnce' deployment configuration.
Why wrong: AllAtOnce updates all instances simultaneously, causing downtime.
- D
Configure health checks on the load balancer.
Health checks ensure that only healthy instances receive traffic.
- E
Install the CodeDeploy agent on each instance.
Why wrong: The agent is required for deployment but does not directly prevent downtime.
Question 1,446 of 1,616
CodeDeploy Zero Downtime Prerequisites
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 an Auto Scaling group. The deployment is set to use a 'OneAtATime' deployment configuration. The developer wants to ensure that the deployment does not cause downtime. Which TWO configurations are necessary?
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
✓
Configure a load balancer for the Auto Scaling group.
Option B is correct because registering the Auto Scaling group with a load balancer allows CodeDeploy to deregister each instance before deployment and re-register it after the new application version is installed and passes health checks. This ensures traffic is shifted away from the instance being updated, preventing downtime during a 'OneAtATime' 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.
- ✗
Set the 'IgnoreApplicationStopFailures' flag to true.
Why it's wrong here
This ignores errors during the ApplicationStop lifecycle event, which could cause issues.
- ✓
Configure a load balancer for the Auto Scaling group.
Why this is correct
A load balancer can drain connections and reroute traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use an 'AllAtOnce' deployment configuration.
Why it's wrong here
AllAtOnce updates all instances simultaneously, causing downtime.
- ✓
Configure health checks on the load balancer.
Why this is correct
Health checks ensure that only healthy instances receive traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Install the CodeDeploy agent on each instance.
Why it's wrong here
The agent is required for deployment but does not directly prevent downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think setting 'IgnoreApplicationStopFailures' or using 'AllAtOnce' can achieve zero downtime, but without a load balancer and health checks, traffic cannot be shifted away from instances during deployment.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy uses the load balancer's target group to perform a 'deregister and wait' step before deploying to each instance, ensuring in-flight requests drain. The health checks on the load balancer verify the new application version is healthy before re-registering the instance; if health checks fail, the instance is not returned to service, preventing traffic from reaching a broken deployment. This pattern is essential for blue/green and rolling deployments where traffic shifting is managed at the load balancer level.
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.
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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: Configure a load balancer for the Auto Scaling group. — Option B is correct because registering the Auto Scaling group with a load balancer allows CodeDeploy to deregister each instance before deployment and re-register it after the new application version is installed and passes health checks. This ensures traffic is shifted away from the instance being updated, preventing downtime during a 'OneAtATime' 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: Jul 4, 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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