(Access control is developing rapidly, and various schemes are integrating. On the one hand, major manufacturers have strengthened their cooperation with each other while highlighting their own solutions. For example, both Cisco and Microsoft promise to support each other's access control plan and open their own APIs; On the other hand, efforts to standardize access control are also accelerating. Whether it is based on 802.1x, DHCP or gateway, standardization work is required to support the requirements of interoperability.)