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Google's data centers grow too fast for normal networks, so it builds its own
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Evolving SDN: Tackling challenges for web-scale deployments

Gigaom

Customers want mobility, rapid change, and larger networks that work with less hassle through the use of powerful automation because this enables business to build speed in innovation. Software-defined networking (SDN) embraces these requirements with new dynamic networking features that enhance server value and user services while operating with an existing network.