DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 has a critical application running on EC2 instances in an Auto Scaling group across two Availability Zones. The application uses an EBS volume for local caching. The company wants to ensure that if an instance fails, the cache data is not lost and the replacement instance can use it. Which solution meets this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Amazon EFS instead of EBS for the cache
Option D is correct because an EBS Multi-Attach volume can be attached to multiple instances in the same Availability Zone, but to persist across zones, you need to use a replication mechanism or EFS. However, the question implies a single volume for caching; the best approach is to use ElastiCache or a shared file system. Option A is wrong because snapshots are not real-time. Option B is wrong because a new volume would be empty. Option C is wrong because EBS volumes are zone-specific.
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.
✗
Configure the Auto Scaling group to use a launch template that attaches the same EBS volume to new instances
Why it's wrong here
An EBS volume can only be attached to one instance at a time (unless Multi-Attach, which is limited).
✗
Take periodic EBS snapshots and create a new volume from the snapshot for the replacement instance
Why it's wrong here
Periodic snapshots may lose recent cache data.
✗
Use an EBS Multi-Attach volume and attach it to all instances in the Auto Scaling group
Why it's wrong here
Multi-Attach is limited to a single AZ and up to 16 instances; not suitable for cross-AZ.
✓
Use Amazon EFS instead of EBS for the cache
Why this is correct
EFS is a shared file system accessible across AZs and persists independently of instances.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Amazon EFS instead of EBS for the cache — Option D is correct because an EBS Multi-Attach volume can be attached to multiple instances in the same Availability Zone, but to persist across zones, you need to use a replication mechanism or EFS. However, the question implies a single volume for caching; the best approach is to use ElastiCache or a shared file system. Option A is wrong because snapshots are not real-time. Option B is wrong because a new volume would be empty. Option C is wrong because EBS volumes are zone-specific.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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