具体理解:可参照百度词条  链接




2、默认按24位网络位,8位主机位有一个网段,有254个有效主机,按照主机位越小有效主机数越少,子网越多。再借一位主机位,则分为两个子网,第一个字网为192.168.1.0 (网络地址为192.168.1.0,掩码为255.255.255.128、广播地址为:、有效主机地址为:、第二个子网为192.168.1.128  (网络地址为192.168.1.128,掩码为255.255.255.128、广播地址为:、有效主机地址为:;借两位主机位,则分为四个子网,即192.168.1.0、、、 每子网有主机数62个、掩码为255.255.225.192 。


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