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Computer Science

                                                      Class - XII

                                     Chapter – Networking Concepts

                                               Topic: Advanced Concepts


               Short note


               Cloud Computing
               Cloud computing is the delivery of computing services like servers, storages and more over the Internet.
               The companies that offer these computing services are called cloud providers.
               It may be free or they may charge for cloud computing services based on usage.
               Based on a cloud location, we can classify cloud as:
                   •   Public
                   •   Private

               Based on a service that the cloud is offering, we classify as:
                   •   IaaS (Infrastructure-as-a-Service) Ex- servers, VMs
                   •   PaaS(Platform-as-a-Service) Ex- environment for developing, testing, delivering and managing
                       software applications
                   •   SaaS(Software-as-a-Service) Ex- software applications over the Internet
                   •   FaaS(Functions-as-a-Service), Functions ex. Storage, Database, Information, Process,
                       Application, Integration, Security, Management, Testing-as-a-service

               Here the cloud resources (like servers and storage) are owned and operated by a third-party cloud
               service provider and delivered over the Internet. Microsoft Azure is an example of a public cloud. With a
               public cloud, all hardware, software and other supporting infrastructure is owned and managed by the
               cloud provider.

               In a Public Cloud, same hardware, storage and network devices are shared with other organisations or
               cloud “tenants.” Account and services of public cloud can be managed using a web browser.

               Advantages of public clouds:
                     Lower costs—no need to purchase hardware or software and you pay only for the service you
                       use.
                     No maintenance—your service provider provides the maintenance.
                     Near-unlimited scalability—on-demand resources are available to meet your business needs.
                     High reliability—a vast network of servers ensures against failure.

               A Private Cloud consists of computing resources used exclusively by one organisation. The private cloud
               can be physically located in the organisation or it can be hosted by a third-party service provider.
               In a private cloud, the services and infrastructure (both h/w and s/w) are always maintained on a private
               network/ organisation. In private cloud it is easier for an organisation to customise its resources to meet
               specific IT requirements.
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