- A
Use a blue/green deployment policy.
Why wrong: Blue/green is for deployment, not scaling.
- B
Configure the Auto Scaling group to scale based on the average request count per instance.
This allows the environment to automatically scale based on traffic.
- C
Set the environment's capacity to a fixed number of instances.
Why wrong: Fixed capacity does not allow automatic scaling.
- D
Configure the environment to use rolling updates with a batch size of 50%.
Rolling updates allow gradual deployment and automatic rollback on health check failures.
- E
Enable immutable updates for the environment.
Why wrong: Immutable updates create a new environment and swap, but do not provide automatic rollback on health checks.
Question 1,062 of 1,616
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 company is deploying a critical application using AWS Elastic Beanstalk. The application experiences occasional spikes in traffic. The company wants to ensure that the environment scales automatically and that deployments are rolled back if health checks fail. Which TWO configurations should be used together to meet these requirements? (Choose TWO.)
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 the Auto Scaling group to scale based on the average request count per instance.
Option B is correct because configuring the Auto Scaling group to scale based on the average request count per instance allows the environment to automatically add or remove instances in response to traffic spikes, ensuring dynamic scaling. Option D is correct because rolling updates with a batch size of 50% update instances in batches and automatically roll back the deployment if health checks fail, meeting the rollback requirement. Together, these configurations provide both automatic scaling and safe, self-healing deployments.
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.
- ✗
Use a blue/green deployment policy.
Why it's wrong here
Blue/green is for deployment, not scaling.
- ✓
Configure the Auto Scaling group to scale based on the average request count per instance.
Why this is correct
This allows the environment to automatically scale based on traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set the environment's capacity to a fixed number of instances.
Why it's wrong here
Fixed capacity does not allow automatic scaling.
- ✓
Configure the environment to use rolling updates with a batch size of 50%.
Why this is correct
Rolling updates allow gradual deployment and automatic rollback on health check failures.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable immutable updates for the environment.
Why it's wrong here
Immutable updates create a new environment and swap, but do not provide automatic rollback on health checks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think immutable updates (option E) do not support automatic rollback on health check failure, but in fact they do—by terminating the new environment. However, the question asks for two configurations that together provide automatic scaling and deployment rollback. Option B provides scaling, and option D (rolling updates with a batch size of 50%) provides the specified rollback behavior with gradual updates. Immutable updates lack the batch size granularity and are not the correct choice in this combination. Candidates might incorrectly select option E, not realizing that both rolling and immutable updates support rollback, but only the rolling update configuration includes the batch size parameter mentioned in the option.
Detailed technical explanation
How to think about this question
Elastic Beanstalk's rolling update with batch size controls how many instances are updated at a time; if health checks fail during the process, the deployment is automatically rolled back by reverting the updated instances to the previous configuration. The Auto Scaling group's average request count per instance metric is a custom CloudWatch metric that Elastic Beanstalk can use for target tracking scaling, which dynamically adjusts capacity based on actual load rather than static thresholds.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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 the Auto Scaling group to scale based on the average request count per instance. — Option B is correct because configuring the Auto Scaling group to scale based on the average request count per instance allows the environment to automatically add or remove instances in response to traffic spikes, ensuring dynamic scaling. Option D is correct because rolling updates with a batch size of 50% update instances in batches and automatically roll back the deployment if health checks fail, meeting the rollback requirement. Together, these configurations provide both automatic scaling and safe, self-healing deployments.
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 24, 2026
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