【单选题】【消耗次数：1】
外部路由器真正有效的任务就是阻断来自（ ）伪造源地址进来的任何数据包
①
外部网
②
内部网
③
堡垒主机
④
内部路由器
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相关题目
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具有单一的IP地址
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允许包含内部网络地址的数据包通过该路由器进入
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路由器的转发策略称为路由选择
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Clear, brief
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