这个为啥是A呢？

wulanzhongxue

请解析一下

leort

In Ethernet (as defined in IEEE 802.3), all MAC addresses that have the least significant bit of the most significant byte as “1” are multicast addresses. Thus, for example, 01:00:00:00:00:00 and 49:aa:bb:cc:dd:ee are both multicast MAC addresses

IEEE 802.3 说明了只要first bit是1就表示组播地址
因此开头01 MAC地址是不可能出现的
可以参考这篇关于MAC的文章
https://blog.csdn.net/zhagzheguo/article/details/90549369