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[程序员] 为啥 IPv4 很快就耗尽了，而 MAC 地址却没有呢

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其实这个疑问上学期间学习计算机网络就有了，我感觉 TCP/IP 作为数据链路层之上的协议，那 IPV4 应该是晚于 MAC 地址出现的吧，那为啥 MAC 地址一开始就被设置得这么长，足够扩展，而 IPv4 已经耗尽了呢》

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