配置的最后一部分，包含在清单 11 中，这部分指出了所需保护的资源以及所要采用的认证方式。
The final portion of the configuration, included in Listing 11, indicates which resources you would like to secure and what type of authentication you want to use.
当路由器配置了认证方式，就会鉴别路由信息的收发方。
When the router is configured with authentication, can identify routing information sending and receiving side.
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