Which description of a hybrid SDN framework is true?
Software Defined Networking (SDN) is a network architecture that allows network administrators to manage network services through abstraction of lower-level functionality. It involves separating the control plane and data plane of the network, and centralizing control through an SDN controller.
A hybrid SDN framework refers to a networking architecture that combines traditional networking elements with SDN elements to create a network that is both flexible and efficient. The hybrid approach allows organizations to slowly introduce SDN into their existing network infrastructure, without requiring a complete overhaul.
To answer the question, let's examine each answer choice:
A. The data plane is pulled from the networking element and put in an SDN controller.
This answer is incorrect because the data plane is responsible for forwarding network traffic, and it remains in the networking element. Moving the data plane to the SDN controller would result in significant performance issues, as the controller would be responsible for forwarding all traffic in the network.
B. The control plane is pulled from the networking element and put in an SDN controller.
This answer is also incorrect because it suggests that the entire control plane is moved to the SDN controller. In a hybrid SDN framework, some control plane functionality remains in the networking element, while other functions are moved to the controller.
C. The control plane function is split between an SDN controller and the networking element.
This answer is correct. In a hybrid SDN framework, some control plane functions are performed by the networking element, while others are performed by the SDN controller. For example, routing decisions may be made by the networking element, while policy decisions are made by the SDN controller.
D. The control plane and data plane are pulled from the networking element and put in an SDN controller and SDN agent.
This answer is incorrect because it suggests that both the control plane and data plane are moved to the SDN controller and SDN agent. This would be impractical, as the data plane must remain in the networking element to ensure efficient forwarding of network traffic.