hw4(part1.2 of 1.3) calc max number of hosts per subnet
hw4(part1.2 of 1.3) calc max number of hosts per subnet

jzacsh/netwtcpip-cmp405,jzacsh/netwtcpip-cmp405,jzacsh/netwtcpip-cmp405,jzacsh/netwtcpip-cmp405