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CharacteristicsOn-demand self-service-user defines and modifies the computational needs such as server time, speed of access and data processing, the amount of stored data without interaction with a representative of the service provider;Universal network access services available to consumers on the transmission network of data, regardless of the terminal device;The pooling of resources-supplier of services brings together the resources to service a large number of consumers into a single pool for dynamic redeployment of capacity between consumers in the context of ever-changing demand for power; While consumers are in control of only the basic parameters of the service (e.g., amount of data access speed), but the actual distribution of resources provided by the consumer, the provider undertakes (in some cases, consumers still can manage some physical parameters of redistribution, for example, to specify the desired data processing centre for reasons of geographical proximity);Elasticity-services can be provided, expanded, narrowed, at any time, without additional costs, to interact with the supplier, usually in automatic mode;-Consumption metering service provider automatically calculates the resources used at some level of abstraction (for example, the volume of stored data, bandwidth, number of users, number of transactions), and on the basis of these data, estimates the volume of services supplied to consumers.From the perspective of the provider, through the pooling of resources and inconsistent nature of consumer consumption, cloud computing can save on scale, using less hardware resources than would be required if the selected hardware capacity for each user, and the expense of automation modification of resource allocation substantially reduced costs for subscription services.From the perspective of a consumer of these characteristics allow to receive services with high availability and low risks inoperability, ensure rapid scale computing system due to elasticity without the need to create, maintain, and upgrade their own hardware infrastructure.Convenience and universality of access is provided by the wide availability of services and support for various class terminal devices (personal computers, mobile phones, Internet tablets).
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