远程用户通过当地的isp拔号接入就能访问内扩网，而不是进入基于预设条件的远程访问服务器。

Remote users access an extranet by dialing in through a local ISP, rather than into a premise-based remote access server.

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例如，ISP可以对其拔号调制解调器客户使用透明代理高速缓存，而用户根本不会知道。

For example, an ISP can use transparent proxy caches for its dial-up modem clients without their ever knowing about it.

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