N 国家重点实验室 Chapter two Software defined networking 2.1 concepts and architecture of SDN 2.2 interfaces and protocols 92.3P4 2.4 application and research challenges 2020/5/14 Dr.Zhangi xu,National Key Lab on ISN,Xidian University 12020/5/14 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 1 Chapter two Software defined networking 2.1 concepts and architecture of SDN 2.2 interfaces and protocols 2.3 P4 2.4 application and research challenges