①, with the same IP address, subnet mask address by the length of a 32-bit binary number is.
②, and 32-bit subnet mask IP address corresponding to phase 32, the IP address if a network address, the subnet mask is 1, and 0 otherwise.
③, chestnut give: example: 11111111.11111111.11111111.00000000
Note: the left represents the network number of continuous lengths of No. 1, (when used must be continuous, in theory may not be continuous), the length of the right side denotes a host number of consecutive 0's number.