Microsoft Certified: Azure Fundamentals (AZ-900) Practice Exam

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What kind of cloud service is Azure Functions categorized under?

Infrastructure as a Service (IaaS)
Platform as a Service (PaaS)
Software as a Service (SaaS)
Network as a Service (NaaS)

The correct answer is: Platform as a Service (PaaS)

Azure Functions is categorized under Platform as a Service (PaaS) because it allows developers to build applications and deploy functions without managing underlying infrastructure. In PaaS, the cloud provider manages everything from hardware to the operating system and the runtime environment, allowing developers to focus on coding and building applications. Azure Functions specifically enables event-driven, serverless computing, which abstracts much of the infrastructure management tasks, providing automatic scaling and a pay-as-you-go pricing model based on the execution of functions. This model enhances speed and efficiency, making it suitable for scenarios where quick development and deployment of code is essential, without the need for developers to worry about servers, storage, or networking configurations, which is characteristic of IaaS. In contrast to SaaS, which delivers software applications to end-users and requires little to no development, Azure Functions targets developers directly. Network as a Service (NaaS) focuses specifically on networking services, which is not the primary function of Azure Functions.