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Difficulty: MediumCloud Service Models (IaaS, PaaS, SaaS)

Match each organizational IT deployment scenario on the left to the cloud service model on the right that defines its administrative boundary.

  • Provisioning virtual machines, configuring virtual networks, and maintaining operating system security patchesInfrastructure as a Service (IaaS)
  • Deploying custom web application source code into a managed runtime execution framework and database enginePlatform as a Service (PaaS)
  • Subscribing to a turnkey web-based office productivity suite managed and updated entirely by the vendorSoftware as a Service (SaaS)

Answer

Virtual machine provisioning and operating system patching matches Infrastructure as a Service (IaaS); deploying custom application code to a managed runtime framework matches Platform as a Service (PaaS); subscribing to a vendor-managed end-user application suite matches Software as a Service (SaaS).
IaaS leaves OS administration, network settings, and virtualization setup to the customer. PaaS provides a ready-to-use application execution runtime where the cloud provider maintains the OS. SaaS delivers end-user applications entirely maintained by the cloud provider.

Step-by-Step Solution

1
Determine the cloud responsibility boundary for virtual machine provisioning and OS configuration.
The customer manages the OS, software patches, and networking while the provider handles physical host hardware.
Customer control over virtualized compute and operating systems defines Infrastructure as a Service (IaaS).
2
Determine the cloud responsibility boundary for deploying application source code to a managed runtime environment.
The customer manages only the application code and data, while the provider manages the OS, web server software, and underlying infrastructure.
Abstractions of OS management to support rapid application development define Platform as a Service (PaaS).
3
Determine the cloud responsibility boundary for consuming a web office suite.
The vendor handles all hardware, runtime, application software updates, and maintenance.
Consuming complete, hosted software as an end user defines Software as a Service (SaaS).

Key Concept

Cloud Service Models (IaaS, PaaS, SaaS) and Shared Responsibility Boundaries
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Topics

Cloud Service Models (IaaS, PaaS, SaaS)

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