看第三个8位组 8个子网 就是2的3次方 网络位占3位 剩下5位（没算上最后一个8位组 不用管它） 2的5次方 32 就是每一个子网32个主机位（没排除子网网络号和子网广播）第一个就是0-31 第二个就是32-63 第三个就是 64-95 最后一个8位组不用管 所以是acd d虽然最后一组是255 但是它不是广播 这是我的方法 实在不明白可以给我发消息
关于ccna的一个题目The network 172.25.0.0 has been divided into eigh
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