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کامپیوتر و شبکه::
ابر عمومی، ابر عمومی
A hybrid cloud model is a combination of private clouds with public clouds.
Private and public clouds mainly differ on the type of ownership and access rights that they support.
On the other hand, public cloud resources are available on the Internet to any interested user under pay-as-you-go model.
Hence, small and medium enterprises (SMEs) and governments have started exploring demand-driven provisioning of public clouds along with their existing computing infrastructures (private clouds) for handling the temporal variation in their service demands.
However, policies used by public Cloud providers (Amazon EC2, Microsoft Azure) are not publicly available, and thus a pre-implemented version of these algorithms is not provided with CloudSim.،2.1.2.1 Public Cloud
Public cloud services enable the cloud infrastructure to be used by the general public and they offer users the benefits of rapid scalability and low initial set-up costs.
Google Apps is a popular suite of SaaS applications made available through a public cloud.
As access is restricted to particular users, community clouds may present fewer security risks than public clouds, however with more limited economies of scale they tend to be less flexible in adapting to user needs and costs can be higher.
When data is stored in a public cloud such as Google Apps or Amazon S3 there is no control over its exact location or method of storage.
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