CV0-004 Deployment Practice Question
A cloud engineer is deploying a containerized application on Amazon ECS using the Fargate launch type. The application requires a persistent shared storage volume that can be accessed by multiple tasks simultaneously. The engineer needs to ensure that the storage is highly available and can be mounted to multiple ECS tasks across different Availability Zones. Which storage solution should the engineer use?
⚠ Common exam trap
The trap here is assuming that Amazon EBS can be shared across multiple tasks like a network file system; EBS is block storage with single-attach limitations.
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 file system
Amazon EFS is the correct choice because it provides shared, highly available file storage that can be mounted to multiple ECS tasks across Availability Zones. It uses NFS and is designed for concurrent access. EBS is single-attach, S3 is object storage, and FSx for Windows is for Windows workloads, so they do not meet the requirements.
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 S3 bucket
Why it's wrong here
Amazon S3 is object storage and cannot be mounted as a file system to ECS tasks. While it can be accessed via APIs, it does not provide a POSIX-compliant file system interface required for persistent shared storage. It is not suitable for this use case.
- ✓
Amazon EFS file system
Why this is correct
Amazon EFS is a fully managed, highly available, and scalable file storage service that can be mounted to multiple ECS tasks across different Availability Zones simultaneously. It supports the Network File System (NFS) protocol and is designed for shared access, making it ideal for this requirement.
- ✗
Amazon FSx for Windows File Server
Why it's wrong here
Amazon FSx for Windows File Server provides Windows-native file storage and supports SMB protocol. While it can be shared, it is designed for Windows workloads and may not be the optimal choice for a Linux-based containerized application. It also may not integrate as seamlessly with ECS tasks as EFS does.
- ✗
Amazon EBS volume
Why it's wrong here
Amazon EBS volumes are block storage that can only be attached to a single EC2 instance or ECS task at a time in a specific Availability Zone. They do not support simultaneous access from multiple tasks across different Availability Zones. Therefore, they are not suitable for shared persistent storage in this scenario.
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 |
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.