Which of the following is not an aspect of Software-Defined Networking?

Centralized control in Software-Defined Networking (SDN) involves managing the network from a single, centralized point rather than treating each network device as an isolated entity. While SDN does indeed allow for integration with existing network infrastructure, the critical aspect is not merely leveraging that infrastructure, but fundamentally changing how network devices interact with the control layer.

The correct aspect revolves around the notion of decoupling the control and data planes, allowing for smarter, programmable, and more automated networking. In this architecture, the intelligence is not tied to individual devices but is moved to a central controller, which can manage multiple devices in a more flexible, efficient manner. This flexibility enables dynamic provisioning and adjustments to network behavior based on real-time data and policy.

Thus, while leveraging existing infrastructure is part of implementing SDN, it is not a defining characteristic of SDN itself. Rather, it is how SDN fundamentally rethinks the network's operational model through centralized control and programmability that solidifies its role in modern networking environments.