http://zhidao.baidu.com/question/60929277.html?fr=qrl&fr2=query
1.ISP分配了一個115.64.4.0/22的CIDR地址,下面哪些地址能夠用來作爲主機地址:A.115.64.8.32 B.115.64.7.64 C.115.64.5.255 D.115.64.3.255 E.115.64.3.128 F.115.64.12.128 2.當使用/27來劃分網絡,下面哪些選擇是有效主機地址? A.15.234.118.63 B.83.121.178.92 C.134.178.18.56 D.192.168.19.37 E.201.45.116.159 F.217.63.12.192
解法: