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. Osi / rm 参考模型有3个主要概念：服务、接口和协议，但是 tcp / ip 参考模型最初没有明确区分服务、接口和协议。 一、协议： 网络协议就是通信双方都必须要遵守的规则，.
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