AWS Certified Solutions Architect – Associate (SAA-C03) — Question 970

A company has a multi-tier payment processing application that is based on virtual machines (VMs). The communication between the tiers occurs asynchronously through a third-party middleware solution that guarantees exactly-once delivery.

The company needs a solution that requires the least amount of infrastructure management. The solution must guarantee exactly-once delivery for application messaging.

Which combination of actions will meet these requirements? (Choose two.)

Answer options

• A. Use AWS Lambda for the compute layers in the architecture.
• B. Use Amazon EC2 instances for the compute layers in the architecture.
• C. Use Amazon Simple Notification Service (Amazon SNS) as the messaging component between the compute layers.
• D. Use Amazon Simple Queue Service (Amazon SQS) FIFO queues as the messaging component between the compute layers.
• E. Use containers that are based on Amazon Elastic Kubernetes Service (Amazon EKS) for the compute layers in the architecture.

Correct answer: A, D

Explanation

AWS Lambda is a serverless compute service that eliminates the need to manage underlying servers, offering the lowest operational overhead compared to Amazon EC2 or Amazon EKS. Amazon SQS FIFO queues are designed to guarantee exactly-once processing and preserve the precise order of messages, fulfilling the messaging requirement without requiring custom deduplication logic.