Software-defined networking (SDN) revolutionized network management by separating control software from network devices, enabling centralized control and programmability. NSF funding in the early 2000s through programs like 100×100, GENI, and FIND laid the groundwork for SDN research, leading to key innovations like OpenFlow and the 4D architecture. Cloud hyperscalers like Google, Microsoft, and Meta adopted SDN around 2010 for datacenter virtualization and wide-area traffic engineering, driving commercial success. This created a virtuous cycle of academic research, startup formation, and industry adoption that transformed how modern networks are built and operated across datacenters, enterprises, and cellular networks.
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