LFCA Question #2: Real Exam Question with Answer & Explanation

Question

Which of the following would be the most appropriate use-case for a Function as a Service (FaaS) implementation?

Options

• AAn application that requires a local file system
• BAn application that continuously polls for work to process
• CAn event-driven application with dynamic scaling
• DAn application that requires a regionally- or globally-distributed file system

Explanation

Function as a Service (FaaS) is best suited for event-driven applications that require dynamic scaling, where functions are executed in response to specific triggers without managing underlying servers.

Common mistakes.

• A. FaaS functions are typically stateless and have ephemeral storage, making them unsuitable for applications that require a persistent local file system.
• B. FaaS is not ideal for applications that continuously poll for work, as this would keep the function 'warm' and incur continuous costs, negating the serverless cost-efficiency model.
• D. While FaaS functions can interact with distributed storage services, the FaaS itself does not natively provide a globally-distributed file system; such storage would be a separate, integrated service.

Concept tested. FaaS use cases and characteristics

Reference. https://learn.microsoft.com/en-us/azure/architecture/guide/technology-choices/compute-decision-tree#function-as-a-service-faas

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