All users are authenticated when they attempt to gain access to the Web sites, folders, and files on your Web server. Users do not have to enter a user name and password. All Web browsers support anonymous access. Basic Basic authentication requires all users to have a Windows NT account to log on to a server. Users must enter a user name and password.
Most Web browsers support Basic authentication.
Users do not have to enter a user name and password when they log on to a server. Anonymous Anonymous access lets users who do not have Windows NT accounts connect to the server and use server resources. This type of access reduces the amount of time you spend managing accounts, and you do not have to identify the users who log on to your Web server. By default, all Web client requests use this anonymous account to gain access to Web content. When access is denied, the server prompts the user to enter a valid Windows NT user name and password.