V. A company has been given a block of address with the beginning address 17.12.40.0/26. The company has three departments and needs to divide the addresses into three sub- blocks of 32,16 and 16 addresses. a. Calculate the number of addresses available in this block. Determine the subnet mask for each of the departments. b. Determine the first address and the last address of the sub-block. Sketch the connection of each sub block to the rest of the Internet.