AWS Certified Cloud Practitioner — Question 816

A company has a large number of Linux Amazon EC2 instances across several Availability Zones in an AWS Region. Applications that run on the EC2 instances need access to a common set of files.

Which AWS service or device should the company use to meet this requirement?

Answer options

• A. AWS Backup
• B. Amazon Elastic File System (Amazon EFS)
• C. Amazon Elastic Block Store (Amazon EBS)
• D. AWS Snowball Edge Storage Optimized

Correct answer: B

Explanation

Amazon Elastic File System (Amazon EFS) provides a fully managed, shared file system that can be concurrently mounted by multiple Linux Amazon EC2 instances across multiple Availability Zones. In contrast, Amazon EBS is block storage typically restricted to a single instance in a single Availability Zone, and AWS Backup is a service for automating backups rather than providing active file storage. AWS Snowball Edge is a physical device used for offline data migration and edge computing, which does not address real-time shared access for cloud-based EC2 instances.