Two ways to represent the network mask that would allow $100$ hosts would be:

a$.\frac{?}{25}$

b$.255\mathrm{.}255\mathrm{.}255\mathrm{.}128$

c$.255\mathrm{.}255\mathrm{.}255\mathrm{.}192$

d$.\frac{?}{26}$

What valid host range is the IP address $33\mathrm{.}33.\frac{33\mathrm{.}33}{26}$ a part of$?$

What is the broadcast address of the network $172\mathrm{.}16\mathrm{.}188\mathrm{.}0/22?$

What is the last valid host on the subnetwork $172\mathrm{.}19\mathrm{.}240\mathrm{.}192255\mathrm{.}255\mathrm{.}255\mathrm{.}224?$