Suppose Varendra University has a range of IP address $200\mathrm{.}200\mathrm{.}0\mathrm{.}0/16.$You have to create at least $15$ usable subnets so that each subnet contains as many host as possible. Answer the following What is the class of the given IP block $?$ How many usable Ip address there in each subnet $?$ What will be the subnet mask of the fourth subnet $?$ What will be the second usable IP address of the third subnet $?$