Fundamental
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Fundamental
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PaaS Lets Developers Focus on Application Code
Free sample question, answered and explained below. The AZ-900 Microsoft Azure Fundamentals Exam practice bank has 688 more like it. Try 10 free: instant score, no account.
A software development team at a retail company is creating a new customer-facing web application and backend REST APIs.
The team needs an environment to build, test, and deploy their application code quickly. They want the cloud provider to manage the underlying operating systems, hardware provisioning, web server middleware, and runtime updates so they can focus exclusively on application logic.
Which cloud service type should the development team select?
Explanations
Software as a Service (SaaS)
Software as a Service (SaaS)
What Software as a Service (SaaS) is
Software as a Service (SaaS) is a cloud delivery model where users connect to and use complete, centrally hosted applications over the internet. Examples include Microsoft 365, Microsoft Dynamics 365, and cloud-based email solutions.
Why it doesn't meet the requirement
SaaS delivers finished, ready-to-use software products directly to end users on a subscription basis. It does not provide a custom application development framework or execution platform where software engineers can write, build, and deploy custom proprietary source code and web APIs.
Key characteristics and limitations
- End-user focused: Designed for immediate business productivity rather than software engineering and application hosting.
- Provider-managed stack: The cloud provider manages every layer of the technology stack, from physical hardware up to the application interface and data structures.
- Limited customization: Users can configure tenant settings and UI preferences, but cannot alter the underlying codebase or host custom web services.
This answer would be correct if
The organization needed an out-of-the-box business solution, such as a cloud email platform, customer relationship management (CRM) tool, or team collaboration suite, without building custom software.
Infrastructure as a Service (IaaS)
Infrastructure as a Service (IaaS)
What Infrastructure as a Service (IaaS) is
Infrastructure as a Service (IaaS) is a cloud computing category where a cloud provider supplies fundamental computing resources over the internet, including virtual machines (VMs), physical storage, and software-defined networking.
Why it doesn't meet the requirement
While IaaS offers the highest degree of control over computing environments, it places the burden of configuring, securing, and maintaining the operating system, web servers (such as IIS, Apache, or NGINX), middleware, and language runtimes on the customer. This contradicts the development team's explicit requirement to avoid managing operating systems, middleware, and runtime updates.
Key characteristics and limitations
- High administrative overhead: Requires internal IT staff to handle routine OS patching, antivirus management, and software installations.
- Total OS control: Gives administrators root or administrative access to customize system-level configurations.
- Shared responsibility boundary: The cloud provider is only responsible for the physical data center, physical hardware, and hypervisor layer.
This answer would be correct if
The scenario required complete administrative access to install custom kernel modules, configure legacy operating system dependencies, or perform a direct lift-and-shift migration of existing virtual machine images without refactoring.
On-premises private cloud
On-premises private cloud
What an on-premises private cloud is
An on-premises private cloud is a cloud computing environment where computing, storage, and networking infrastructure are provisioned and operated exclusively for a single organization within its own physical data center or colocation facility.
Why it doesn't meet the requirement
Operating in a private cloud or on-premises environment requires the organization's staff to purchase, install, power, cool, and maintain physical server hardware, network switches, virtualization hypervisors, and operating systems. This represents the exact opposite of shifting administrative tasks to a cloud service provider.
Key characteristics and limitations
- Full customer responsibility: The organization retains 100% of the operational and maintenance burden across all physical and logical layers.
- High Capital Expenditure (CapEx): Requires substantial upfront capital investments in physical hardware, facility leases, and infrastructure licenses.
- Slower deployment speed: Scaling compute capacity requires procurement, shipping, physical mounting, and manual configuration of physical hardware.
This answer would be correct if
The organization had strict regulatory, compliance, or legacy hardware requirements that strictly prohibited hosting data in public cloud environments and mandated complete physical ownership of all infrastructure.
Platform as a Service (PaaS)
Platform as a Service (PaaS)
What Platform as a Service (PaaS) is
Platform as a Service (PaaS) is a cloud computing model that provides a complete, managed environment in the cloud for developing, testing, deploying, and maintaining applications. Under this model, the cloud provider delivers and manages the physical hardware, networking, virtualization layer, operating system (OS), middleware, database software, and runtime environments.
How it meets the team's requirements
- Abstracts infrastructure management: The development team does not need to configure virtual machines, apply security patches to operating systems, or manage network routing.
- Provides pre-configured runtimes: Services like Azure App Service and Azure SQL Database allow developers to deploy code directly without installing web server software or database engines.
- Focus on business logic: Eliminating administrative overhead enables the development team to focus 100% of their effort on writing code, designing REST APIs, and optimizing the customer experience.
Key advantages and capabilities
- Built-in scalability: Easily scales compute resources automatically (autoscaling) based on traffic demand.
- Integrated developer tools: Provides native integration with continuous integration/continuous deployment (CI/CD) pipelines and source control systems.
- Reduced operational costs: Lowers administrative expenses by shifting system maintenance, backup routines, and high availability configurations to the cloud provider.
- Accelerated time-to-market: Enables rapid prototyping and deployment cycles without waiting for infrastructure provisioning.
Why this is optimal
Compared to IaaS, which requires ongoing OS maintenance, or SaaS, which provides fixed end-user applications rather than a developer platform, PaaS strikes the exact balance required for custom web and API development.
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