ccna on linux

ccna on linux.AuthorizationAuthorization: Gives different privileges to different users and restricts the services they can use. For example.After a user has successfully logged into the switch, the administrator can authorize the commands used by the user to configure the switch.3 Accounting: Records all actions taken by the user in using network services, including the type of service used, login start and end times, data traffic, etc. It is not only a security tool, but also allows users to be billed for accessing the network. Cisco provides the following 2 common methods of implementing AAA authentication.1 Local AAA authentication: Authentication using a local database, where the user name and password are stored locally on a network device such as a Cisco router or switch, and the user is authenticated against the local database. Local AAA authentication is ideal for smaller networks.2 Server-based AAA authentication: Server-based AAA authentication is a more scalable solution. When using this method, the network device accesses the AAA server, which stores the user names and passwords of all users. Commonly used AAA servers include RADIUS (RemoteAuthentication DialIn User Service) or TACACS4- (TerminalAccessControllerAccessControlSystem, TerminalAccessControllerAccessControlSystem). control system). A comparison of the TACACS+ protocol and the RADIUS protocol is shown in Table 20-2. The working process of server-based AAA authentication is described below.1 The client establishes a connection with a network device (such as a router or switch).2 The network device prompts the user for a user name and password.3 The network device uses the AAA server to verify the legitimacy of the user name and password..388.Cisco Networking Lab CCNA Lab Guide (Release 2) Table 20-2 TACACS+ Protocol and RADIUS Protocol Comparison