域名”通常由哪四个部分组成？“IP地址”又是怎样构成的？ 因特网上一台主机的域名由哪几个部分组成
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IP地址由4部分数字组成，每部分数字对应于8位二进制数字，各部分之间用小数点分开，如某一台主机的IP地址为：211.152.65.112 。
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