题目内容

【说明】
某公司采用100M宽带接入Internet,公司内部有15台PC机,要求都能够上网。另外有2台服务器对外分别提供Web和E-mail服务,采用防火墙接入公网,拓扑结构如下图所示。
如果防火墙采用.NAPT技术,则该单位至少需要申请(1)个可用的公网地址。

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