802.11协议介绍（802.11 protocol introduction）.docVIP

802.11协议介绍（802.11 protocol introduction） The 802.1x protocol originated in the 802.11 agreement, the latter is the wireless LAN IEEE protocol, 802.1x protocol is designed to make access authentication to solve the problem of wireless LAN users. The IEEE802LAN protocol defines the network does not provide authentication, as long as the user can access the LAN control equipment (such as LANS Witch), you can access the LAN equipment or resources. It is not obvious in the early stage of the existence of security risks of enterprise network cable in LAN application environment. But with the development of large-scale mobile office and resident network operations and other applications, service providers need to user access control and configuration. Especially the application of WLAN and LAN access in telecom network scale, it is necessary to control the port to achieve user level access control, 802.lx is IEEE in order to solve the port based access control (Port-Based Network Access Contro1) and a standard definition. IEEE 802.1x ID is based on the user or device on the network client (or port) authentication standard. This process is called port level authentication. It uses RADIUS (Remote Authentication Dial In User Service) method, which is divided into three different groups: request, authentication and authorization server. The 820.1x standard used in trying to connect to the port or other equipment (such as Cisco Catalyst or Cisco Aironet series switch access point) (certification party) and a terminal of the user (request). Authentication and authorization by the authentication server (such as Cisco Secure ACS) is to achieve communication. IEEE 802.1x provides automatic user identification, centralized authentication, key management and LAN connection configuration. The above three parts, the whole design of the 802.1x implementation, the requester system, authentication system and authentication server system. It introduces the contents of the three: Request sy