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【简答题】
静态路由是指由网络管理员 (1) 配置的路由信息。当网络的拓扑结构或链路的状态发生变化时，网络管理员需要手工去修改路由表中相关的静态路由信息。静态路由信息在缺省情况下是(2)的，不会传递给其他的路由器。当然，网管员也可以通过对路由器进行设置使之成为共享的。静态路由一般适用于(3) 的网络环境，在这样的环境中，网络管理员易于清楚地了解网络的拓扑结构，便于设置正确的路由信息。使用静态路由的一个好处是(4)。动态路由因为需要路由器之间频繁地交换各自的 (5) ，而对路由表的分析可以揭示网络的拓扑结构和网络地址等信息。因此，网络出于安全方面的考虑可以采用静态路由。
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