单选题CIDR地址块192.168.10.0/20所包含的IP地址范围是(  )。A192.168.10.0~192.168.12.255B192.168.10.0~192.168.13.255C192.168.0.0~192.168.14.255D192.168.0.0~192.168.15.255

单选题
CIDR地址块192.168.10.0/20所包含的IP地址范围是(  )。
A

192.168.10.0~192.168.12.255

B

192.168.10.0~192.168.13.255

C

192.168.0.0~192.168.14.255

D

192.168.0.0~192.168.15.255


参考解析

解析:
CIDR地址由网络前缀和主机号两部分构成。CIDR将网络前缀都相同的连续的IP地址组成“CIDR地址块”。题目中的CIDR块的网络前缀的长度为20位,主机号为12位,因此192.168.10.0/20地址块中的地址数为212个。其中,当主机号为全0时,取最小地址即为192.168.0.0。当主机号全为1时,取最大地址192.168.15.255。应注意主机号为全0和全1的地址一般不使用。

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