You learned the foundations of Software-Defined Networking.
SDN architecture: Control plane separates from data plane. Controllers decide. Switches forward.
OpenFlow: Standard protocol for controller-switch communication. Flow tables with match-action rules.
Controllers: OpenDaylight and ONOS are popular. Deploy in clusters for HA.
SD-WAN: SDN for wide area networks. Reduces costs and improves performance.
NFV: Network functions as software. Service chaining links functions.
Intent-based: Describe what you want. Systems translate to configuration.
SDN transforms networks into programmable platforms.