The correct answer is to configure the Auto Scaling group to scale based on average request count per instance and to use rolling updates with a batch size of 50%. The first option ensures that Elastic Beanstalk auto scaling responds dynamically to traffic spikes by adding or removing instances based on actual request load rather than static CPU thresholds, which is more precise for web applications. The second option meets the rollback deployment requirement because rolling updates with a 50% batch size replace instances in groups and automatically revert the entire deployment if health checks fail on any batch, providing self-healing without manual intervention. On the AWS Certified Developer Associate DVA-C02 exam, this tests your understanding of how Elastic Beanstalk combines scaling policies with deployment policies to achieve both elasticity and safety. A common trap is choosing “immutable updates” instead of rolling updates—immutable updates launch a full new environment and do not automatically roll back on health failures; they only swap URLs. Memory tip: think “Rolling 50% = half at a time, full rollback on fail” to pair with “Request count scaling = traffic-driven growth.”
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 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 often confuse immutable updates with rolling updates, assuming immutable updates also support automatic rollback on health check failure, but immutable updates only fail the deployment without reverting the environment to the previous version.
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.
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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Question Discussion
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