SAA-C03 Question #437: Real Exam Question with Answer & Explanation

Question

A solutions architect is provisioning an Amazon Elastic File System (Amazon EFS) file system to provide shared storage across multiple Amazon EC2 instances. The instances all exist in the same VPC across multiple Availability Zones. There are two instances in each Availability Zone. The solutions architect must make the file system accessible to each instance with the lowest possible latency. Which solution will meet these requirements?

Options

• ACreate a mount target for the EFS file system in the VPC. Use the mount target to mount the file
• BCreate a mount target for the EFS file system in one Availability Zone of the VPC. Use the mount
• CCreate a mount target for each instance. Use each mount target to mount the EFS file system on
• DCreate a mount target in each Availability Zone of the VPC. Use the mount target to mount the

Explanation

Amazon EFS requires a mount target in each Availability Zone where EC2 instances access the file system. This is because each mount target provides an elastic network interface in the subnet and AZ, reducing network latency by allowing EC2 instances to communicate locally with the EFS mount target. Creating a mount target in each AZ optimizes file system access performance and availability. Instances mount the EFS file system via the mount target in their respective AZ, which provides the lowest possible latency and avoids cross-AZ traffic. Option A, with only a single mount target in the VPC, will cause cross-AZ traffic for instances in other AZs, increasing latency and potentially incurring data transfer costs. Option B is incomplete and introduces complexity with sharing directories across instances. Option C is invalid because mount targets are per AZ and per subnet, not per instance.

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