The answer is to use an EBS Multi-Attach volume attached to all instances in the Auto Scaling group. This is correct because EBS Multi-Attach allows multiple EC2 instances within the same Availability Zone to concurrently read and write to a single block-level volume, ensuring data persistence across instance failure without requiring snapshots or data migration. When an instance fails, the replacement instance simply attaches the same shared volume and resumes work immediately, as the data remains intact and accessible. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of shared block storage versus ephemeral or file-based solutions; a common trap is choosing EBS snapshots, which introduce recovery latency, or EFS, which is a file system incompatible with applications expecting raw block devices. Remember the key constraint: Multi-Attach volumes are limited to Nitro-based instances and a maximum of 16 attachments per volume, so verify instance type compatibility. Memory tip: think "Multi-Attach = Multi-Instance, Same AZ, No Downtime."
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 runs a critical application on EC2 instances in an Auto Scaling group. The application uses an EBS volume attached to each instance for temporary data. The company needs to ensure that if an instance fails, the data is not lost, and the new instance can resume quickly. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an EBS Multi-Attach volume attached to all instances in the Auto Scaling group
Using an EBS Multi-Attach volume allows multiple instances in the same AZ to attach the same volume, providing shared access and quick recovery. Option A is wrong because EBS snapshots are point-in-time and take time to restore. Option C is wrong because EFS is a file system, not block storage, and may not be compatible with the application. Option D is wrong because instance store is ephemeral.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Store temporary data on instance store volumes instead of EBS
Why it's wrong here
Instance store is ephemeral and data is lost on failure.
✗
Use an EBS snapshot and create a new volume from the snapshot for the new instance
Why it's wrong here
Snapshots have restore time and may not be up-to-date.
✗
Migrate to Amazon EFS and mount the same file system on all instances
Why it's wrong here
EFS is a file system and may not support all application requirements.
✓
Use an EBS Multi-Attach volume attached to all instances in the Auto Scaling group
Why this is correct
Multi-Attach allows shared block storage across instances in the same AZ.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use an EBS Multi-Attach volume attached to all instances in the Auto Scaling group — Using an EBS Multi-Attach volume allows multiple instances in the same AZ to attach the same volume, providing shared access and quick recovery. Option A is wrong because EBS snapshots are point-in-time and take time to restore. Option C is wrong because EFS is a file system, not block storage, and may not be compatible with the application. Option D is wrong because instance store is ephemeral.
What should I do if I get this DOP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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?
hard
A.Configure the Auto Scaling group to use a launch template that attaches the same EBS volume to new instances
B.Take periodic EBS snapshots and create a new volume from the snapshot for the replacement instance
C.Use an EBS Multi-Attach volume and attach it to all instances in the Auto Scaling group
✓ D.Use Amazon EFS instead of EBS for the cache
Why D: 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.
Last reviewed: Jun 20, 2026
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This DOP-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 DOP-C02 exam.
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