问题:
【简答题】某路由器具有下列路由表项: 网络前缀 下一跳 142.150.64.0/24 A 142.
答案:
解:(1)B; 142.150.71.132的IP分组可以表示为142.150.01000111.10000100,与各路由掩码想与,只有B符合; (2);即特定主机路由 (3);即缺省路由 (4)子网掩码255.255.255.192,即第4字节前2位作为子网表示 142.150.64.00*,142.150.64.01*,142.150.64.10*,142.150.64.11*。去掉主机位全0、1不用,即如下: 142.150.64.1~142.150.64.62, 142.150.64.65~142.150.64.126, 142.150.64.129~142.150.64.190, 142.150.64.193~142.150.64.254