- A
Amazon S3
Why wrong: S3 is object storage, not a POSIX filesystem.
- B
Amazon Elastic Block Store (EBS)
Why wrong: EBS can only be attached to one instance at a time.
- C
Amazon RDS
Why wrong: RDS is a database service.
- D
Amazon Elastic File System (EFS)
EFS is a shared file system for multiple instances.
Question 1,193 of 1,616
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. 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 needs 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 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 shared persistent storage when containers running on separate EC2 instances need to access the same data simultaneously.
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 S3
Why it's wrong here
S3 is object storage, not a POSIX filesystem.
- ✗
Amazon Elastic Block Store (EBS)
Why it's wrong here
EBS can only be attached to one instance at a time.
- ✗
Amazon RDS
Why it's wrong here
RDS is a database service.
- ✓
Amazon Elastic File System (EFS)
Why this is correct
EFS is a shared file system for multiple instances.
Related concept
Read the scenario before looking for a memorised answer.
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 can be shared across instances, but EBS volumes are single-instance attachments by default, while EFS is purpose-built for concurrent multi-instance access.
Detailed technical explanation
How to think about this question
EFS uses the NFSv4.1 protocol and automatically scales storage capacity up to petabytes as files are added or removed, without requiring any provisioning. Under the hood, EFS distributes data across multiple Availability Zones within a region, providing high durability and availability; however, it is important to note that EFS performance modes (General Purpose vs. Max I/O) and throughput modes (Bursting vs. Provisioned) can significantly impact application latency and cost, especially for workloads with high I/O demands.
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?
Deployment — This question tests Deployment — 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 shared persistent storage when containers running on separate EC2 instances need to access the same data simultaneously.
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.
About these practice questions
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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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