Which statement compares traditional networks and controller-based networks?
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A. B. C. D.D.
The correct answer is D. Only controller-based networks decouple the control plane and the data plane.
Traditional networks are built with individual devices (routers, switches, firewalls, etc.) that are configured manually and operate independently. In a traditional network, the control plane (which manages the flow of network traffic and network topology) and the data plane (which forwards packets from one device to another) are both handled by each individual device.
Controller-based networks, on the other hand, use a centralized controller that manages the network and its devices. The controller separates the control plane from the data plane, allowing for more efficient and flexible network management. With a controller-based network, network administrators can manage policies and configurations across the entire network from a single location.
Option A is incorrect because controller-based networks do support centralized management, which is actually one of their main advantages over traditional networks.
Option B is incorrect because both traditional and controller-based networks can abstract policies from device configurations. In traditional networks, this is typically done using templates or scripting tools. In controller-based networks, policies can be defined centrally and pushed out to all devices.
Option C is incorrect because controller-based networks also offer a centralized control plane, which is managed by the controller.