The wonderful thing about software-defined networking is it takes core network function out of the realm of purpose-built hardware powered by custom silicon and moves it into the world of software that runs on generic x86 and commodity network hardware.
The bad thing about software-defined networking (SDN) is the same. Moreover, a lot of that network function in your data centers — and even in some branches — performs in the same compute infrastructure as the rest of your compute workloads. Consequently, SDN can actually compete for limited CPU resources with other work in the data center.
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