- A
Amazon EBS with Multi-Attach
Why wrong: Amazon EBS Multi-Attach is limited to a few instances in the same AZ and does not support NFS. It is not suitable for shared file systems across tasks.
- B
Amazon EFS
Amazon EFS is a fully managed NFS file system that can be mounted by multiple ECS tasks across multiple AZs, providing a shared file system.
- C
Amazon S3
Why wrong: Amazon S3 is an object store, not a file system. It does not support NFS protocol or concurrent file-level locking.
- D
Amazon FSx for Lustre
Why wrong: Amazon FSx for Lustre is designed for high-performance computing workloads, not for general-purpose file sharing. It is not the best fit for this use case.
Question 1,107 of 1,746
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 designing a new application that will run on Amazon ECS with Fargate. The application must be able to read and write files to a shared file system that is accessible from multiple tasks simultaneously. The file system must be durable and support NFS protocol. Which storage solution 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 is the correct choice because it provides a fully managed, durable, NFS-based (Network File System) shared file system that can be mounted concurrently by multiple Amazon ECS tasks running on Fargate. EFS supports the NFSv4.1 and NFSv4.0 protocols, ensuring simultaneous read/write access across tasks, and its data is replicated across multiple Availability Zones for durability.
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.
- ✗
Amazon EBS with Multi-Attach
Why it's wrong here
Amazon EBS Multi-Attach is limited to a few instances in the same AZ and does not support NFS. It is not suitable for shared file systems across tasks.
- ✓
Amazon EFS
Why this is correct
Amazon EFS is a fully managed NFS file system that can be mounted by multiple ECS tasks across multiple AZs, providing a shared file system.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3
Why it's wrong here
Amazon S3 is an object store, not a file system. It does not support NFS protocol or concurrent file-level locking.
- ✗
Amazon FSx for Lustre
Why it's wrong here
Amazon FSx for Lustre is designed for high-performance computing workloads, not for general-purpose file sharing. It is not the best fit for this use case.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Amazon EBS Multi-Attach with a shared file system, but EBS Multi-Attach is block-level storage limited to a single AZ and incompatible with Fargate, whereas EFS is a fully managed NFS file system designed for multi-task, multi-AZ access.
Detailed technical explanation
How to think about this question
Under the hood, Amazon EFS uses a distributed data store and a fleet of NFS servers to provide a standard NFSv4.1 interface, allowing concurrent access from thousands of EC2 instances or Fargate tasks across multiple Availability Zones. A subtle behavior is that EFS enforces close-to-open consistency, meaning that after a write is closed, subsequent opens from other clients will see the updated data, but concurrent writers to the same file without coordination can lead to data corruption. In a real-world scenario, a microservices-based application processing shared logs or configuration files benefits from EFS’s automatic scaling and pay-per-use model, eliminating the need to provision storage capacity upfront.
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.
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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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 is the correct choice because it provides a fully managed, durable, NFS-based (Network File System) shared file system that can be mounted concurrently by multiple Amazon ECS tasks running on Fargate. EFS supports the NFSv4.1 and NFSv4.0 protocols, ensuring simultaneous read/write access across tasks, and its data is replicated across multiple Availability Zones for durability.
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.
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Last reviewed: Jul 4, 2026
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