Arp 属于数据链路层，理由按照 osi 参考模型，数据链路层封装 ip 报文时，需要通过 arp 获取链路层目的地址，添加到报文头部，这就不属于网络层的功能了。 结论：在 tcp/ip 模式中. 计算机osi各层的数据传输单位如下： 物理层：单位是 比特。在物理层，数据还没有被组织，仅作为原始的位流或电气电压进行处理。 数据链路层：传输单元是 帧。数据链路.
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