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?（）

单项选择题 You have been asked to come up with a subnet mask that will allow all three web servers to be on the same network while providing the max number of subnets.Which network address and subnet mask meet this requirement?（）