What primary function does the SDN controller perform?
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Correct answer: Making routing decisions.
Why this is the answer
The SDN controller acts as the brain of the Software-Defined Network, centralizing control and intelligence. Its primary function is to make routing decisions for the entire network. It communicates these decisions to the data plane devices (switches and routers), which then execute the forwarding instructions. Forwarding packets is a function of the data plane devices, not the controller. Multicast replication at the hardware level is also a data plane function. Fragmenting and reassembling packets typically occurs at the IP layer on end devices or routers, not as a primary function of the SDN controller.
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