它允许网络访问服务器(NAS)执行对用户的验证、授权和记帐。
It allows a network access server (NAS) to perform authentication, authorization, and accounting for users.
为了执行验证、映射和授权，就需要使用外部安全提供者。
To perform the authentication, mapping, and authorization, an external security provider is required.
代理身份验证和授权：中间层服务器执行身份验证。
Proxy authentication and authorization: the middle-tier server performs authentication.
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