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Cloud computing represents the delivery of computing as a service, whereby such resources as CPU, software, information, and devices are provided to end-users as a metered service over the Internet. Cloud computing provides a vastly efficient, flexible, and cost-effective way for IT to meet escalating business needs: IT as a Service. This paper considers two scenarios. First, some multinational corporations rent the IT infrastructure and services from a Cloud provider to build a virtual datacenter/cluster for their branches all over the world. Second, a Cloud datacenter provides transaction services of electronic commerce for some small companies.
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