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【简答题】
长度为 100 字节的应用层数据交给运输层传送,需要加上 20 字节的 TCP 首部。再交给网络层传送,需要加上 20 字节的网络层首部。最后交给数据链路层传送,需要加上 20 字节的首部和 18 字节的尾部,试求数据的传输效率。(提示:数据的传输效率指的是发送的应用层的有效数据除以整个数据长度)
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C.
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D.
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E.
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