- A
Amazon Elastic File System (EFS)
EFS is a scalable file system that can be mounted on multiple EC2 instances concurrently.
- B
Amazon Elastic Block Store (EBS)
Why wrong: EBS volumes cannot be shared across multiple instances.
- C
Amazon Simple Storage Service (S3)
Why wrong: S3 is object storage, not file storage.
- D
Amazon DynamoDB
Why wrong: DynamoDB is a NoSQL database, not a file system.
Question 219 of 1,616
How to Use EFS as a Shared File System for Multiple Containers
This DVA-C02 practice question tests your understanding of development with aws services. 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 developer wants to deploy a containerized application on AWS. The application requires persistent storage that can be accessed by multiple containers running on different EC2 instances. Which AWS service 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 Elastic File System (EFS)
Amazon EFS provides a fully managed, scalable, and elastic NFS file system that can be mounted concurrently on multiple EC2 instances across different Availability Zones. This makes it the ideal choice for a containerized application requiring shared persistent storage accessible by multiple containers running on different instances, as it supports the NFSv4.1 and NFSv4.0 protocols for simultaneous access.
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 Elastic File System (EFS)
Why this is correct
EFS is a scalable file system that can be mounted on multiple EC2 instances concurrently.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon Elastic Block Store (EBS)
Why it's wrong here
EBS volumes cannot be shared across multiple instances.
- ✗
Amazon Simple Storage Service (S3)
Why it's wrong here
S3 is object storage, not file storage.
- ✗
Amazon DynamoDB
Why it's wrong here
DynamoDB is a NoSQL database, not a file system.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse EBS with EFS, assuming EBS supports multi-instance access by default, but EBS volumes are single-instance attached unless using the limited multi-attach feature, which is not designed for general-purpose shared file system use.
Detailed technical explanation
How to think about this question
EFS uses a distributed data storage architecture where data is automatically replicated across multiple Availability Zones within a region, providing high durability and availability. Under the hood, EFS leverages the NFSv4.1 protocol with support for file locking and consistency semantics, enabling concurrent reads and writes from multiple EC2 instances without data corruption. A real-world scenario is a containerized web application using EFS to share uploaded media files or configuration data across a fleet of containers running in an Amazon ECS or EKS cluster, where each container needs to access the same persistent storage regardless of which EC2 instance it runs on.
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.
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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 Elastic File System (EFS) — Amazon EFS provides a fully managed, scalable, and elastic NFS file system that can be mounted concurrently on multiple EC2 instances across different Availability Zones. This makes it the ideal choice for a containerized application requiring shared persistent storage accessible by multiple containers running on different instances, as it supports the NFSv4.1 and NFSv4.0 protocols for simultaneous access.
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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