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Pervasive virtualization at the edge and in the network core drives the evolution of the IT infrastructure towards a service-oriented model. It permits a move from static arrangements of resources that persist over long periods of time to highly dynamic arrangements that respond to the needs of customers by dynamically provisioning necessary network and edge resources with some notion of optimality. Clouds are one type of virtualized service offered as a unified hosting substrate for diverse applications, using various technologies to virtualize servers and orchestrate their operation.
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