This section first introduces the E/E architecture network security design and the Zonal architecture network security design from the aspects of intra-domain identity authentication，intra-domain authorized communication，inter-domain identity authentication，and inter-domain authorized communication. Then，the important role of situational awareness platform in the field of intelligent networked vehicles is explained，and the theoretical basis and workflow of situational awareness platform are elaborated from both product architecture and technical architecture. Finally，the automotive network security and data security defense technologies are divided into two categories：passive defense based on applied cryptography and active defense based on intrusion detection，and their development background and practical application technologies are sorted out respectively.