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An organization is planning to migrate its web applications to Microsoft Azure. The development team wants to deploy and manage application code and configurations directly without having to provision, configure, or patch the underlying virtual machines and operating systems.
Which cloud service model in Azure meets these requirements?
Platform as a Service (PaaS) is a cloud computing service model where a cloud provider like Microsoft Azure provides a complete hosting environment for building, deploying, and managing applications. Under PaaS, the cloud provider manages the underlying infrastructure—including hardware, networking, virtualization, operating systems, and middleware—freeing developers to focus entirely on application code and business logic.
PaaS strikes the ideal balance for developers who want to avoid the administrative burden of infrastructure maintenance while retaining the flexibility to build and deploy custom application architectures in the cloud.
Software as a Service (SaaS) is a cloud delivery model where end users access complete, centrally hosted applications over the internet on a subscription basis. Examples include products like Microsoft 365, Dynamics 365, and cloud-based collaboration platforms.
SaaS does not meet the requirement because it does not provide an application development or deployment platform for custom software code. Under SaaS:
The organization required an off-the-shelf business solution—such as email hosting, customer relationship management, or office productivity tools—without developing any proprietary application code.
SaaS delivers the highest level of provider management in the cloud shared responsibility spectrum, leaving the least amount of operational management to the customer.
Infrastructure as a Service (IaaS) is a cloud computing model that delivers virtualized computing resources over the internet. In Azure, services such as Azure Virtual Machines, Azure Virtual Network, and Azure Disk Storage represent classic IaaS solutions where the cloud vendor manages physical hardware and datacenters while the consumer manages the virtual infrastructure.
While IaaS provides the greatest level of control over cloud resources, it fails to meet the organization's goal of avoiding operating system and VM maintenance. In an IaaS model, the customer remains directly responsible for:
IaaS would be the correct choice if the organization needed complete control over custom operating system kernels, legacy system dependencies, or specific low-level networking configurations not supported in managed environments.
IaaS represents the foundational layer of cloud computing and serves as a direct cloud equivalent to traditional virtualized servers in on-premises environments.
An on-premises private datacenter represents a traditional hosting environment where an organization owns, operates, and maintains all physical facilities, server hardware, networking infrastructure, virtualization hypervisors, and software layers within its own facilities or private colocation spaces.
Hosting applications in a private on-premises datacenter directly contradicts the requirement to eliminate operating system and virtual machine maintenance. In this model:
The organization had strict regulatory mandates requiring physical possession of datacenter hardware, or needed to maintain legacy mainframe hardware that cannot run on public cloud infrastructure.
Moving from an on-premises datacenter to cloud computing shifts hardware and infrastructure maintenance responsibilities from internal IT departments to cloud service providers like Microsoft Azure.
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