单选题下列IPv6地址表示中,错误的是( )。A21AD::D1:0:1/48B3D:0:2AA:D0:2F38:1::/64CFE80:0:0:0:0:FE:FE80:2A1DFE11::70D:BC:0:80:0:0:7CB
单选题
下列IPv6地址表示中,错误的是( )。
A
21AD::D1:0:1/48
B
3D:0:2AA:D0:2F38:1::/64
C
FE80:0:0:0:0:FE:FE80:2A1
D
FE11::70D:BC:0:80:0:0:7CB
参考解析
解析:
IPv6地址占128位,使用冒号十六进制记法,它把每个16位的值用十六进制值表示,各值之间用冒号分隔。在十六进制记法中,允许把数字前面的0省略。冒号十六进制记法可以允许零压缩,即一连串连续的零可以为一对冒号所取代,为了保证零压缩有一个不含混的解释,规定在任一地址中只能使用一次零压缩。冒号十六进制记法可结合使用点分十进制记法的后缀。IPv6不支持子网掩码,它只支持前缀长度表示法。D项,该表示形式已有8个位段,没有全0位段压缩,不应该使用双冒号::。
IPv6地址占128位,使用冒号十六进制记法,它把每个16位的值用十六进制值表示,各值之间用冒号分隔。在十六进制记法中,允许把数字前面的0省略。冒号十六进制记法可以允许零压缩,即一连串连续的零可以为一对冒号所取代,为了保证零压缩有一个不含混的解释,规定在任一地址中只能使用一次零压缩。冒号十六进制记法可结合使用点分十进制记法的后缀。IPv6不支持子网掩码,它只支持前缀长度表示法。D项,该表示形式已有8个位段,没有全0位段压缩,不应该使用双冒号::。
相关考题:
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