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A Comprehensive Guide To The Different Service Models Of Cloud Computing

Service Models Of Cloud Computing

Cloud computing is a technology that enables organizations to access data and applications over the Internet. This technology has revolutionized the way businesses operate and has created new opportunities for organizations of all sizes. Cloud computing has taken over the mainstream IT industry and has become an increasingly popular option for businesses of all sizes. It’s flexible, scalable, and can be a cost-effective way to power your business. There are so many different service models of cloud computing to choose from.

There are four different service models of cloud computing, which are:

  1. Infrastructure as a Service (IaaS)
  2. Platform as a Service (PaaS)
  3. Software as a Service (SaaS)
  4. Function as a Service (FaaS)

Each of these service models has its own advantages and disadvantages. In this blog, we will take a comprehensive look at each of the different service models of cloud computing.

In the previous blog of our CCNA 200-301 series , we talked about the concept of virtualization and cloud computing. I recommend you go through it before you jump to this blog. 

Keep reading to learn more!

Various Service Models of Cloud Computing:

1. Infrastructure as a Service (IaaS)

  • Infrastructure as a Service (IaaS) is the most basic and foundational cloud computing service model. 
  • With IaaS, the cloud provider offers virtualized computing resources, including servers, storage, and networking equipment. 
  • It provides GUI and API-based access.
  • Users can rent these resources and have complete control over them, installing and running their choice of an operating system, software, and applications. 
  • IaaS is ideal for organizations that need complete control over their computing resources, have complex applications that require significant customization, or need to handle sudden spikes in usage. 

Advantages of IaaS: 

  • Allows for complete control and customization of infrastructure.
  • Typically offers high scalability and flexibility.
  • Lower upfront costs compared to on-premise infrastructure.

Disadvantages of IaaS: 

2. Platform as a Service (PaaS) 

  • Platform as a Service (PaaS) is a cloud computing model that offers a platform for application development, deployment, and management. 
  • With PaaS, the cloud provider provides a preconfigured platform that includes operating systems, database systems, and development tools. 
  • Users can focus on developing applications rather than worrying about infrastructure and management. 
  • It has the ability to auto-scale.
  • PaaS is ideal for organizations that want to develop, test, and deploy applications quickly, without the need for extensive infrastructure management. 

Advantages of PaaS: 

  • Allows for accelerated application development and deployment – 
  • Offers pre-configured development tools and platforms – 
  • Lower ongoing costs compared to IaaS 

Disadvantages of PaaS: 

  • Limited control over infrastructure and development tools.
  • May require customization to meet specific needs or requirements.
  • The updates occur themselves. The user does not need to update anything.
  • You can access it over the Internet.
  • Scaling limitations may be present Examples of PaaS providers include Heroku, IBM Cloud, and Oracle Cloud Platform. 

3. Software as a Service (SaaS)

  •  Software as a Service (SaaS) is a cloud computing model in which the cloud provider offers on-demand access to software applications over the internet. 
  • With SaaS, the provider manages the infrastructure, software, and data, while users interact with the software via a web browser or mobile app. 
  • SaaS is ideal for organizations that want to minimize IT resource requirements, reduce upfront costs, and have access to software on a subscription basis.
  • Examples of SaaS providers include Salesforce, Dropbox, and Microsoft Office 365. 

Advantages of SaaS: 

  • Low upfront costs as it follows the pay-as-you-go model.
  • Easy to deploy and manage with little to no IT resources.
  • Automatic scaling with no infrastructure management required.

Disadvantages of SaaS: 

  • Limited customization options.
  • May require internet connectivity to access software.
  • May not integrate with existing software tools or workflows.

4. Function as a Service (FaaS):

  • Function as a Service (FaaS) is a cloud computing model that allows developers to create and deploy small, self-contained pieces of code as functions. 
  • With FaaS, the cloud provider manages the infrastructure, scaling, and availability, while developers focus on writing the code. 
  • FaaS is ideal for organizations that want to create microservices, small applications, or automate specific tasks within larger applications.
  • Some of the examples of FaaS providers are AWS Lambda, Google Cloud Functions, and Microsoft Azure Functions.

Advantages of FaaS: 

  • Extreme scalability and flexibility.
  • Cost-effective, pay-per-use pricing model.
  • Simplifies development and deployment of small, modular functions.

Disadvantages of FaaS: 

  • Limited programming language support compared to other service models.
  • Limited runtime environments and execution times compared to other service models.
  • High latency and cold start times may be present.


Cloud computing has transformed how organizations operate, providing a range of service models to meet various business needs. Whether you need complete infrastructure control or want to develop and deploy applications quickly, cloud computing can offer significant benefits. 

Understanding the different service models of cloud computing can help you take the CCNA 200-301 exam. Understanding the service models of cloud computing is very crucial to have a basic understanding of virtualization and cloud computing.

Stay tuned for upcoming blogs on deployment modes in cloud computing in CCNA Series.

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