CCNA IP 计算题Which command would correctly configure a serial port on a router with the last usable host address in the 192.216.32.32/29 subnet?A.router (config-if)# ip address 192.216.32.38 255.255.255.240 B.router (config-if)# ip address 192.216.32.39 255.255.255.224 C.router (config-if)# ip address 192.216.32.63 255.255.255.248 D.router (config-if)# ip address 192.216.32.39 255.255.255.248 E.router (config-if)# ip address 192.216.32.63 255.255.255.24
问题描述：
CCNA IP 计算题
Which command would correctly configure a serial port on a router with the last usable host address in the 192.216.32.32/29 subnet?A.router (config-if)# ip address 192.216.32.38 255.255.255.240 B.router (config-if)# ip address 192.216.32.39 255.255.255.224 C.router (config-if)# ip address 192.216.32.63 255.255.255.248 D.router (config-if)# ip address 192.216.32.39 255.255.255.248 E.router (config-if)# ip address 192.216.32.63 255.255.255.248 F.router (config-if)# ip address 192.216.32.38 255.255.255.248 Answer:F 怎么算出来的
答
/29是表示子网掩码,也就是前29位二进制都用来表示网络位,换算成十进制表达就是：255.255.255.248.逆向算法是只有32-29=3位用来表示主机位.所以最后一个段应该为256-2的3次方=248.上面也提到最多只有3个位用于表示主...