Cloud Computing Stack: Three Distinct Categories | Exam 400-151 Answer

Cloud Computing Stack Categories


Which three distinct categories are within the cloud computing stack? (Choose three.)



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A. B. C. D. E. F.


Sometimes the three are referred to, together, as the Cloud Computing Stack.

-> Infrastructure as a Service (IaaS) -> Platform as a Service (PaaS) -> Software as a Service (SaaS)

Cloud computing stack refers to the layers of cloud computing architecture that are used to provide services to users over the internet. There are typically three main categories or layers within the cloud computing stack: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS).

  1. Infrastructure as a Service (IaaS): IaaS is the foundation layer of the cloud computing stack, which provides virtualized computing resources such as servers, storage, and networking infrastructure over the internet. It enables users to rent and use computing infrastructure without having to buy or maintain physical hardware. Examples of IaaS providers include Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform (GCP).

  2. Platform as a Service (PaaS): PaaS is the middle layer of the cloud computing stack that provides a platform for developing, testing, and deploying applications over the internet. It offers a complete development and deployment environment, including tools, libraries, and runtime environments to create, run, and manage applications. Examples of PaaS providers include Heroku, Google App Engine, and Microsoft Azure App Service.

  3. Software as a Service (SaaS): SaaS is the top layer of the cloud computing stack, which provides software applications over the internet on a subscription basis. It allows users to access software applications without having to install or maintain them on their local devices. Examples of SaaS applications include Salesforce, Dropbox, and Google Workspace.

Other categories that may be mentioned as part of the cloud computing stack but are less commonly used include:

  • Network as a Service (NaaS): NaaS is a layer that provides virtualized network infrastructure, including routers, switches, and firewalls, over the internet.
  • Desktop as a Service (DaaS): DaaS provides virtualized desktop environments to users over the internet.
  • Logging as a Service (LaaS): LaaS provides a centralized platform for logging, monitoring, and analyzing logs generated by applications and infrastructure in the cloud.

Therefore, the correct answer to the question is: B. PaaS C. IaaS D. SaaS