$1.$ Assign PC$4$ the IP $172\mathrm{.}24\mathrm{.}59\mathrm{.}16$ and a subnet of $255\mathrm{.}255\mathrm{.}255\mathrm{.}248.$ Why won$$t Packet Tracer let you assign this IP $($be specific as to why you get the error and cannot assign this address$)?$