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1. Private cloud
Where an infrastructure cloud services, operated only for a particular organization. Cloud infrastructure that can be managed by the organization or by a third party. The location can be on-site or off-site. Usually with large-scale organizations are able to have / manage private cloud.
2. Community cloud
In this model, a cloud infrastructure is shared by several organizations that have similar interests, for example in terms of its mission, or the level of security needed, and more.
Thus, community cloud is a limited development of the private cloud. And the same also with the private cloud, the cloud infrastructure that is able to be managed by one of the organization, nor by a third party.
3. Public cloud
As simple as the name implies, this type is intended for public cloud by service provider. The services that I mentioned earlier can be used as an example of public cloud.
4. Hybrid cloud
For this type, the cloud infrastructure available is a composition of two or more infrastructure cloud (private, community, or public). Although the entity where they stand on their own, but are linked by a technology / mechanism that enables data and application portability across cloud it. For example, load balancing mechanism that antarcloud, so that the allocation of resources can be maintained at optimal levels.
So a little explanation of the models are extracted from the NIST cloud. However, as recognized by this agency, the definition and limitation of Cloud Computing itself is still searching for the form and its standards. Where later it is the market that will determine which model will survive and which model to die.
But all agree that cloud computing will be the future of the computing world. Even the prestigious research institute Gartner Group has also stated that Cloud Computing is a discourse that is not to be missed by all stakeholders in the IT world, from this moment and in the foreseeable future.
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