题目内容

设某路由器建立了路由表（这3列分别是目的网络、子网掩码和下一跳路由器，若直接交付则最后一列表示应当从哪个接口转发出去），见下表.路由表现在共收到5个分组，其目的站IP地址分别为：（1）128.96.39.10（2）128.96.40.12（3）128.96.40.151（4）192.4.153.17（5）192.4.153.90试分别计算下一跳。

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假设1Km长的CSMA/CD网络的数据率是1Gbps,设信号在网络上的传播速率是200000km/s,求能偶使用此协议的最短有效帧长是多少？

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