The document discusses Software-Defined Networking (SDN), defining it as an emerging architecture that is dynamic, manageable, cost-effective and adaptable. It describes SDN protocols like OpenFlow that give access to network switches. It outlines the key aspects of the SDN architecture including being directly programmable, centrally managed, programmatically configured, and open standards-based. It also lists several related open-source SDN projects and protocols involved in SDN like Open vSwitch, ONAP, DPDK, OpenDaylight, ONOS, and PNDA.