SDNs

Software-Defined Networking, or SDN, is an approach to network management that separates the network's control plane from its data plane. This separation allows network administrators to manage network services and traffic flow in a more centralized and programmable way. In traditional networks, the control logic is distributed across individual network devices like routers and switches, making them complex to manage and update. SDN centralizes this control logic into a software-based controller.

The SDN controller acts as the "brain" of the network. It communicates with network devices using protocols like OpenFlow, instructing them on how to forward traffic. This allows for dynamic configuration and management of the network, enabling greater agility and innovation. Applications can interact with the controller to request network resources or define traffic policies, making the network more responsive to changing application needs.

Key benefits of SDN include improved network performance, enhanced security through centralized policy enforcement, and reduced operational costs due to simplified management. It also facilitates automation and enables the creation of sophisticated network services. SDN is a foundational technology for modern networking, particularly in data centers, cloud environments, and enterprise networks seeking greater flexibility and control.