PAS-C01 Migration Practice Question
A company is migrating an on-premises application to AWS. The application requires low-latency access to a shared file system that can be mounted by multiple EC2 instances simultaneously. Which storage solution should they 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 scalable, shared file system for multiple EC2 instances. Option A is correct. Option B is wrong because EBS volumes can be attached to only one instance. Option C is wrong because S3 is object storage, not a file system. Option D is wrong because Instance Store is ephemeral.
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 managed NFS file system for multiple instances.
- ✗
Amazon Elastic Block Store (EBS)
Why it's wrong here
EBS volumes cannot be shared across instances.
- ✗
Amazon Simple Storage Service (S3)
Why it's wrong here
S3 is object storage, not a POSIX file system.
- ✗
Amazon EC2 Instance Store
Why it's wrong here
Instance Store is ephemeral and local to one instance.
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 |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-C01 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 PAS-C01 exam.