Using the commands network $172\mathrm{.}16\mathrm{.}10\mathrm{.}00\mathrm{.}0\mathrm{.}0\mathrm{.}255$ area $0$ and network $192\mathrm{.}168\mathrm{.}0\mathrm{.}00\mathrm{.}0\mathrm{.}255\mathrm{.}255$ area $0.$ You can finalize with end. What is the area used for? Why is area #$0$ special?