- A
Amazon EC2 instance store
Why wrong: Instance store is ephemeral and not available in Fargate.
- B
Amazon EFS file system
EFS can be used as a shared volume in Fargate.
- C
Amazon S3 bucket
Why wrong: S3 is not a file system for ECS.
- D
Amazon EBS volume
Why wrong: EBS is not supported in Fargate.
Question 1,574 of 1,616
ECS Fargate Shared Persistent Storage: Using Amazon EFS for Multi-Container Tasks
This DVA-C02 practice question tests your understanding of development with aws services. 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 developer wants to deploy a containerized application to Amazon ECS using Fargate. The application requires persistent storage that can be shared across multiple containers in the same task. Which storage option should the developer use?
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 provides a shared, persistent, and scalable file system that can be mounted by multiple containers within the same ECS task using Fargate. EFS supports the Network File System (NFS) protocol, allowing concurrent read/write access from all containers in the task, which meets the requirement for shared persistent storage. Unlike ephemeral or block storage options, EFS is designed for multi-attach scenarios and persists independently of the container lifecycle.
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 EC2 instance store
Why it's wrong here
Instance store is ephemeral and not available in Fargate.
- ✓
Amazon EFS file system
Why this is correct
EFS can be used as a shared volume in Fargate.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3 bucket
Why it's wrong here
S3 is not a file system for ECS.
- ✗
Amazon EBS volume
Why it's wrong here
EBS is not supported in Fargate.
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 cannot be attached to multiple Fargate containers or tasks simultaneously, making EFS the only correct choice for shared persistent storage in this context.
Detailed technical explanation
How to think about this question
Under the hood, EFS uses the NFSv4.1 protocol and provides a regional file system that can be mounted by Fargate tasks using the EFS integration via the `volumes` and `mountPoints` configuration in the task definition. A subtle behavior is that EFS access points can enforce a specific POSIX user/group and directory path, which is critical for multi-tenant workloads to prevent cross-container file permission issues. In a real-world scenario, a web application with multiple containers (e.g., a PHP app and an Nginx reverse proxy) might share an EFS volume for uploaded media files, ensuring both containers have consistent access without data duplication.
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.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon EFS file system — Amazon EFS provides a shared, persistent, and scalable file system that can be mounted by multiple containers within the same ECS task using Fargate. EFS supports the Network File System (NFS) protocol, allowing concurrent read/write access from all containers in the task, which meets the requirement for shared persistent storage. Unlike ephemeral or block storage options, EFS is designed for multi-attach scenarios and persists independently of the container lifecycle.
What should I do if I get this DVA-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
This DVA-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 DVA-C02 exam.
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