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Types of clouds computing

NIST classifies the cloud into four different types. They are:

Private Cloud:

Provisioning of infrastructure for controlled access by a single organisation (or) providing controlled access to restricted data and information for few organisations in a closed network format is referred to as private cloud. All business units within the organisation can access the cloud without having to build their own infrastructure.
An organisation can choose to manage the cloud by itself or take the services of a third party. The third party cloud service provider may host the private cloud within the premises of the organisation or in its data centre. Private cloud deployment is best suited for enterprises looking at a higher level of control and regulatory measures.
The most significant advantage of private cloud is that it offers better and direct control over sensitive data as well as the hardware used. It also enables building the infrastructure with the most reasonably new hardware components. Other significant advantages of a private cloud are easy moving of data into cloud due to better proximity and enhanced security levels.

2. Public Cloud:


A public cloud is one based on the standard cloud computing model, in which a service provider makes resources, such as virtual machines (VMs), applications or storage, available to the general public over the internet. Public cloud services may be free or offered on a pay-per-usage model.

The main benefits of using a public cloud service are:
it reduces the need for organizations to invest in and maintain their own on-premises IT resources;
it enables scalability to meet workload and user demands; and
there are fewer wasted resources because customers only pay for the resources they use.

3. Community Cloud:

A community cloud is a type of cloud primarily used by a closed group of people or organisations. It is a collaborative effort, and the hardware infrastructure is mutually shared by two or more organisations from a specific community. It could either be managed or hosted internally within an organisation in the community or by a third-party cloud service provider. The infrastructure costs are shared among the community members based on mutual agreements. Popular example would be the Virginia Community College System that has implemented a community cloud to provide educational, informational and administrative services to 23 colleges from around 40 campuses.

4. Hybrid Cloud:

As the name implies, a cloud that is a combination of two or more clouds (public cloud, private cloud or community cloud) is called as hybrid cloud. In a hybrid cloud environment, workloads can be moved between private and the public clouds based on changing computing needs and costs. This allows enhanced flexibility and more options when it comes to data deployment. For instance, consider an organisation dealing with a large amount of personal data that wants to move some of its workload to the cloud. In this case, the organisation can use its private cloud to host workloads dealing with sensitive information and the public cloud service for all non-critical applications.

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