In a software-defined network, the function of the controller is to **make routing decisions**[1][1]. The controller acts as the strategic control point, managing flow control to the switches and routers, consolidating and mediating between different controller domains, and allowing network administrators to manage the network effectively[1]. Unlike traditional networking where hardware devices control network traffic, in SDN, the controller, often using protocols like OpenFlow, separates the network's control functions from its forwarding functions, enabling centralized management and control of the network through software-based controllers[1][1]. Therefore, the primary role of the controller in a software-defined network is to determine how data packets should be routed within the network, emphasizing routing decisions over other functions like packet forwarding, multicast replication, or packet fragmentation and reassembly.
I don't think C is very correct, forwarding data should be a function of the data plane, however among the given options I think it is the most correct.
What is the function of the controller in a software-defined network?
A. forwarding packets
B. multicast replication at the hardware level
C. setting packet-handling policies
D. fragmenting and reassembling packets
WHAT WILL BE ANSWER FOR THIS ONE GUYS?
An SDN controller is an application in a software-defined networking (SDN) architecture that manages flow control for improved network management and application performance. The SDN controller platform typically runs on a server and uses protocols to tell switches where to send packets.
C is correct - Several articles on the purpose of an SDN controller confirms that the controller becomes the control plane. The purpose of the control plane is to "control" how data is forwarded then let the data plane perform the rest.
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