- A
Reduce the Auto Scaling group cooldown period.
Why wrong: Reducing the cooldown period does not prevent data loss; it only affects scaling speed.
- B
Enable sticky sessions on the Application Load Balancer.
Why wrong: Sticky sessions ensure requests go to the same instance, but if that instance is terminated during scale-in, the session data stored on local instance store is lost.
- C
Increase the instance size to reduce scaling events.
Why wrong: Increasing instance size reduces scaling frequency but does not eliminate data loss when instances are terminated.
- D
Use Elastic Block Store (EBS) volumes instead of instance store.
Using EBS volumes instead of instance store provides persistent storage that survives instance termination, preserving data without requiring application code changes.
DOP-C02 Instance Store Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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: instance Store. 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 runs a stateful application on EC2 instances in an Auto Scaling group. The application stores state on local instance storage. During a scaling event, users lose session data. How can the company make the application resilient without modifying the application code?
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
Use Elastic Block Store (EBS) volumes instead of instance store.
Option D is correct because using EBS volumes instead of instance store provides persistent storage that survives instance termination. By attaching an EBS volume to the EC2 instances and configuring the application to store state on that volume (e.g., through the same file path), the data is preserved even when instances are scaled in. This does not require modifying application code, only infrastructure configuration. Option A is incorrect because reducing the cooldown period does not prevent data loss; it only affects scaling speed. Option B is incorrect because sticky sessions route users to the same instance but do not preserve session data when that instance is terminated during scale-in. Option C is incorrect because larger instances reduce the frequency of scaling events but data loss still occurs when instances are terminated.
Key principle: Instance Store
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Reduce the Auto Scaling group cooldown period.
Why it's wrong here
Reducing the cooldown period does not prevent data loss; it only affects scaling speed.
- ✗
Enable sticky sessions on the Application Load Balancer.
Why it's wrong here
Sticky sessions ensure requests go to the same instance, but if that instance is terminated during scale-in, the session data stored on local instance store is lost.
- ✗
Increase the instance size to reduce scaling events.
Why it's wrong here
Increasing instance size reduces scaling frequency but does not eliminate data loss when instances are terminated.
- ✓
Use Elastic Block Store (EBS) volumes instead of instance store.
Why this is correct
Using EBS volumes instead of instance store provides persistent storage that survives instance termination, preserving data without requiring application code changes.
Related concept
Instance Store
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is assuming that sticky sessions (session affinity) provide resilience by routing users to the same instance. However, sticky sessions do not prevent data loss when that instance is terminated during scale-in events.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Instance Store
- EBS Volume
- Auto Scaling Group
- Sticky Sessions
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
Instance Store
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Review instance Store, then practise related DOP-C02 questions on the same topic to reinforce the concept.
- →
Resilient Cloud Solutions — study guide chapter
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Resilient Cloud Solutions practice questions
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Instance Store.
What is the correct answer to this question?
The correct answer is: Use Elastic Block Store (EBS) volumes instead of instance store. — Option D is correct because using EBS volumes instead of instance store provides persistent storage that survives instance termination. By attaching an EBS volume to the EC2 instances and configuring the application to store state on that volume (e.g., through the same file path), the data is preserved even when instances are scaled in. This does not require modifying application code, only infrastructure configuration. Option A is incorrect because reducing the cooldown period does not prevent data loss; it only affects scaling speed. Option B is incorrect because sticky sessions route users to the same instance but do not preserve session data when that instance is terminated during scale-in. Option C is incorrect because larger instances reduce the frequency of scaling events but data loss still occurs when instances are terminated.
What should I do if I get this DOP-C02 question wrong?
Review instance Store, then practise related DOP-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Instance Store
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Last reviewed: Jun 20, 2026
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