Problem $2$: An organization has been assigned the prefix $212\mathrm{.}1\mathrm{.}1/24$ and wants

to form subnets for $4$ departments, with hosts as follows: A $75$ hosts; B $35$

hosts; C $20$ hosts; and D $18$ hosts. Note that each department forms a subnet.

$(1)$ Is that possible to use the same subnet mask to all $4$ departments?

$(2)$ If yes, give a possible IP address assignment for each department use the

smallest size subnet. If no$,$ give a possible arrangement of subnet masks

and IP address assignments.