What benefit does controller-based networking provide versus traditional networking?

Controller-based networking, often associated with Software-Defined Networking (SDN), centralizes control plane functions. This allows administrators to configure, manage, and monitor the entire network from a single, unified interface, simplifying operations and improving agility. The other options are incorrect because: While SDN can enhance security through policy enforcement, its primary benefit isn't solely protection from DDoS attacks. Controller-based networking separates the control plane (handled by the controller) from the data plane (handled by network devices), rather than combining them, which is a key architectural shift. Controller-based networking is an operational model, not an architectural change from two-tier to three-tier, though it can be implemented on various architectures.