A network $192\mathrm{.}168\mathrm{.}3\mathrm{.}0,$ is divided into four sub$-$networks. Assuming that the original subnet mask is $255\mathrm{.}255\mathrm{.}255\mathrm{.}192,$A network $192\mathrm{.}168\mathrm{.}3\mathrm{.}0,$ is divided into four sub$-$networks. Assuming that the original subnet mask is $255\mathrm{.}255\mathrm{.}255\mathrm{.}192,$