AWS Certified Solutions Architect – Professional — Question 207

You want to mount an Amazon EFS file system on an Amazon EC2 instance using DNS names. Which of the following generic form of a mount target's DNS name must you use to mount the file system?

Answer options

• A. availability-zone.file-system-id.efs.aws-region.amazonaws.com
• B. efs-system-id.availability-zone.file-aws-region.amazonaws.com
• C. $file-system-id.$availability-zone.$efs.aws-region.$amazonaws.com
• D. #aws-region.#availability-zone.#file-system-id.#efs.#amazonaws.com

Correct answer: A

Explanation

The correct answer, A, presents the proper format for the DNS name required to mount an Amazon EFS file system, which includes the availability zone, file system ID, and the AWS region. The other options either rearrange these components incorrectly or use placeholder symbols that are not valid in the DNS naming convention.