Cloud computing is based and accelerated on SDNs...
Enabling the Digital Revolution: SDN and Beyond @ MIT TR
"...data centers are undergoing a once-in-a-generation architectural shift, from hardware- to software-centric models. Just as virtual machines supplanted physical servers as the fundamental element of modern server applications, software-defined networking (SDN) is now emerging as a more flexible, manageable way to organize a data center’s network needs."
"Software-defined networking (SDN) is an approach to computer networking that allows network administrators to programmatically initialize, control, change, and manage network behavior dynamically via open interfaces [1] and abstraction of lower-level functionality. SDN is meant to address the fact that the static architecture of traditional networks doesn't support the dynamic, scalable computing and storage needs of more modern computing environments such as data centers. This is done by decoupling or disassociating the system that makes decisions about where traffic is sent (the control plane) from the underlying systems that forward traffic to the selected destination (the data plane)."
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