SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
A company is migrating an on-premises Java application to AWS. The application uses a shared file system for storing configuration files and user uploads. The company wants to minimize changes to the application and ensure that the file system is highly available and scalable. Which AWS service should be used?
⚠ Common exam trap
The trap here is assuming that Amazon S3 can be used as a file system without changes, but S3 requires SDK integration and is not a POSIX-compliant shared file system.
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 (Amazon EFS).
Amazon EFS is a fully managed NFS file system that provides shared access across multiple EC2 instances and Availability Zones. It requires no application changes and automatically scales, meeting the requirements for high availability and scalability. Other options either do not provide a shared file system or require application modifications.
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 (Amazon EFS).
Why this is correct
Amazon EFS is a fully managed, scalable, and highly available NFS file system that can be mounted on multiple EC2 instances across Availability Zones. It supports POSIX permissions and can be used without application changes. This makes it ideal for a shared file system for configuration files and user uploads, meeting the requirements for high availability and scalability.
- ✗
Amazon S3 with the AWS SDK for Java to read and write files.
Why it's wrong here
Amazon S3 is object storage, not a file system. The application would need significant code changes to use the AWS SDK instead of standard file I/O. S3 does not provide a mountable file system with POSIX semantics, so it would not minimize changes. While S3 is highly available and scalable, it is not a drop-in replacement for a shared file system.
- ✗
Amazon Elastic Block Store (Amazon EBS) with Multi-Attach enabled.
Why it's wrong here
Amazon EBS Multi-Attach allows a volume to be attached to multiple Nitro-based EC2 instances in the same Availability Zone, but it does not provide a shared file system. It is block storage and requires a cluster-aware file system to avoid data corruption. It is not highly available across Availability Zones and does not scale automatically, making it unsuitable for this scenario.
- ✗
Amazon FSx for Windows File Server.
Why it's wrong here
Amazon FSx for Windows File Server provides a fully managed Windows file system with SMB protocol. While it is highly available and scalable, it is designed for Windows workloads and requires SMB. The application is Java-based and likely uses NFS or a POSIX-compliant file system, so FSx for Windows File Server would introduce unnecessary changes and compatibility issues.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
This SAP-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 SAP-C02 exam.