$(5$ marks$)$ Create and apply a numbered ACL that allows access to the web server

only from $172\mathrm{.}16\mathrm{.}224\mathrm{.}0/20$ and $172\mathrm{.}18\mathrm{.}192\mathrm{.}0/19,$ denying other traffic. Show any

calculations and explain the purpose of each configuration command.