Drag & drop a new Cisco router $1841$ and name it WestBuilding and connect it to Border$2$; use the FastEthernet$0/1$ interface in each end. Then, set the interfaces to $172\mathrm{.}16\mathrm{.}4\mathrm{.}1/30$ in Border$2$ and $172\mathrm{.}16\mathrm{.}4\mathrm{.}2/30$ in WestBuilding. Also, add a computer PC$2$ and connect it to the router through another switch. Finally, set the PC$2$ address to $172\mathrm{.}16\mathrm{.}5\mathrm{.}3/24$ and the gateway, which is the new routers remaining interface, to $172\mathrm{.}16\mathrm{.}5\mathrm{.}1/24\mathrm{.}17.$

A ping from PC$2$ to PC$1$ would fail. Fix it keeping in mind that you would also be allowing PC$2$ to get to the servers if you could apply changes to the router ISP. Then, explain what you did.