DEA-C01 Data Store Management Practice Question
A company needs to store files that are accessed by multiple EC2 instances in a VPC. The files must be concurrently accessible and durable. Which storage solution should the data engineer choose?
⚠ Common exam trap
Many exam-takers confuse Amazon EBS Multi-Attach with a general-purpose shared file system, but EBS Multi-Attach is limited to specific io1/io2 volumes, requires cluster-aware applications, and does not provide the POSIX file system semantics or cross-AZ durability that EFS offers.
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 provides a fully managed, scalable, and elastic NFS file system that can be concurrently accessed by multiple EC2 instances across multiple Availability Zones. It is designed for high durability (11 nines of durability) and automatically replicates data across multiple AZs within a region, meeting the requirements for concurrent access and durability.
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 durable.
- ✗
Amazon Simple Storage Service (Amazon S3)
Why it's wrong here
S3 is object storage, not a file system.
- ✗
Amazon Elastic Block Store (Amazon EBS)
Why it's wrong here
EBS volumes cannot be attached to multiple instances concurrently.
- ✓
Amazon Elastic File System (Amazon EFS)
Why this is correct
EFS provides a shared, durable file system for EC2 instances.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-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 DEA-C01 exam.