Which statement about the SDN framework environment is true?

Question

Options

• AThe control plane function is split between an SDN controller and the networking element
• BThe control plane and data plane are pulled from the networking element and put in an SDN
• CThe data plane is controlled by a centralized SDN element
• DThe control plane is pulled from the networking element and put in an SDN controller
• EThe data is pulled from the networking element and put in an SDN controller

• A
  2% (1)
• B
  2% (1)
• D
  95% (39)

Explanation

The defining characteristic of Software-Defined Networking (SDN) is the decoupling of the control plane from the data plane. In a traditional network device (router/switch), both planes reside on the same hardware - the control plane makes routing/forwarding decisions, and the data plane executes them. In SDN, the control plane is removed from individual devices and centralized in an SDN controller, which programs the data plane of multiple network elements via southbound APIs (e.g., OpenFlow). The data plane remains in the networking element to forward packets at line rate. Option A is wrong because the control plane is not split - it is fully relocated to the controller. Option B is wrong because the data plane stays in the device. Option C is wrong because the data plane is not 'controlled by a centralized SDN element' - the control plane is centralized, not the data plane. Option E conflates data forwarding with control intelligence.

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