What is the primary benefit of separating the control plane from the data plane in network devices?
Correct Answer: B
Detailed Explanation: Separating the control plane from the data plane is a fundamental concept in SDN. In traditional networks, each device contains both a control plane (responsible for routing and network decisions) and a data plane (responsible for forwarding packets). In an SDN architecture, the control plane is decoupled from the network devices and centralized in an SDN controller. This centralization (Option B) allows for a consistent, holistic view of the network, enabling rapid updates, policy enforcement, and streamlined configuration across the entire network. Centralized decision‑making improves efficiency by eliminating the need to manually configure each device and by ensuring that all network devices follow the same set of policies. This design greatly enhances scalability and simplifies troubleshooting, as changes can be made centrally and then propagated across the network. Options A, C, and D do not capture this core benefit, making Option B the correct choice.
This CCNA practice question helps students prepare for Cisco networking certification exams by testing knowledge of network fundamentals, routing, switching, and network security concepts.