Traditional networking uses fixed-function hardware appliances like switches, routers, and firewalls to deliver networking services. Each traditional networking element is configured independently, which can be time-consuming and operationally challenging as the network scales.
By contrast, SDN uses virtualization to accelerate network provisioning and management by allowing operators to perform these functions, networkwide, in centralized SDN controllers using an abstract copy of the physical network. SDN controllers also centrally store and manage forwarding tables for overall improved traffic flows throughout the network.
www.juniper.net/us/en/research-topics/what-is-sdn.html
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