单项选择题 You are working in a data center environment and are assigned the address range 10.188.31.0/23.You are asked to develop an IP addressing plan to allow the maximum number of subnets with as many as 30 hosts each.Which IP address range meets these requirements?（）

单项选择题 Which IPv6 address is the equivalent of the IPv4 interface loopback address 127.0.0.1?（）

单项选择题 Given an IP address 172.16.28.252 with a subnet mask of 255.255.240.0, what is the correct network addres?（）