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Update d05-IP-Addressing.md

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Peng Hailin 2019-08-30 14:52:01 +08:00 committed by GitHub
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@ -221,7 +221,7 @@ IP 地址分配的规则有：**网络上的每个地址，都要是其主机所
`0000 0001 = 1`
`0111 1111 = 126`
`0111 1111 = 127`
**在网络中，是不可以有全`0`地址的**。在加入其它三个`8`位二进制数后，就可以看到`A`类地址的全貌了。就像下面的那样。