$11\mathrm{.}1\mathrm{.}8$ Check Your Understanding $-$ IPv$4$ A

Host$-$A has the IPv$4$ address and subnet mask $172\mathrm{.}16\mathrm{.}4\mathrm{.}100255\mathrm{.}255\mathrm{.}0\mathrm{.}0.$ What is the network address of Host$-$A$?$