- A
EC2 Instance Store
Why wrong: Instance Store is ephemeral and not shared.
- B
Amazon EFS
EFS provides a shared file system for multiple instances.
- C
Amazon S3
Why wrong: S3 is object storage, not a file system.
- D
Amazon EBS
Why wrong: EBS cannot be shared across multiple instances.
Question 1,646 of 1,746
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 wants to deploy a containerized application on AWS. The application requires persistent storage that can be shared across multiple containers running on different EC2 instances. Which AWS service should be used?
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
✓
Amazon EFS
Amazon EFS provides a fully managed, scalable, and elastic NFS file system that can be mounted concurrently on multiple EC2 instances. This makes it the ideal choice for persistent storage that must be shared across containers running on different EC2 instances, as it supports the NFSv4.1 and NFSv4.0 protocols and automatically scales storage capacity as files are added or removed.
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.
- ✗
EC2 Instance Store
Why it's wrong here
Instance Store is ephemeral and not shared.
- ✓
Amazon EFS
Why this is correct
EFS provides a shared file system for multiple instances.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3
Why it's wrong here
S3 is object storage, not a file system.
- ✗
Amazon EBS
Why it's wrong here
EBS cannot be shared across multiple instances.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Amazon EBS with a shared storage solution, but EBS volumes (except for the limited multi-attach feature) can only be attached to a single EC2 instance at a time, making it unsuitable for multi-instance shared access.
Detailed technical explanation
How to think about this question
Amazon EFS uses a distributed data storage architecture where data is stored across multiple Availability Zones (if configured as regional) and accessed via a mount target in each AZ. The file system automatically grows and shrinks as files are created and deleted, with no need for provisioning, and it provides strong consistency for reads and writes after a successful write operation. In a real-world scenario, a container orchestration platform like Amazon ECS or Kubernetes can use EFS as a persistent volume for stateful applications (e.g., content management systems or data analytics) that require shared access across multiple pods or tasks running on different EC2 instances.
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
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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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Design for New Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon EFS — Amazon EFS provides a fully managed, scalable, and elastic NFS file system that can be mounted concurrently on multiple EC2 instances. This makes it the ideal choice for persistent storage that must be shared across containers running on different EC2 instances, as it supports the NFSv4.1 and NFSv4.0 protocols and automatically scales storage capacity as files are added or removed.
What should I do if I get this SAP-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.
About these practice questions
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Last reviewed: Jul 4, 2026
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