Download Cisco Packet Tracker from the list of tools and install it either in your computer or in a Windows virtual machine.Section A: Understanding routing$1.$ Open the provided Cisco lab file Configuring default routes.pka. Show the routing table for Border$1.$ Capture a screenshot$\mathrm{.}2.$ In what case would the gateway of last resort be used if set?$3.$ If PC$0$ tried to get to the Web Server, what configuration in PC$0$ must be correctly set so that the first device to communicate with is Border$1?$ What is the value of this configuration?$4.$ Try the command tracert $10\mathrm{.}10\mathrm{.}10\mathrm{.}254$ in PC$0.$ You can cancel after a few lines with Ctrl$+$C$.$ The only IP address the packets gets to is $172\mathrm{.}16\mathrm{.}3\mathrm{.}1,$ so it does not get past Border$1.$ What is the only IP address shown if you try a similar command from the DNS Server to PC$0?$ What device and interface this IP belongs to$?5.$ You need to set up the default route $($or last resort gateway$)$ in Border$1.$ From the privileged exec mode, execute ip route $0\mathrm{.}0\mathrm{.}0\mathrm{.}00\mathrm{.}0\mathrm{.}0\mathrm{.}0172\mathrm{.}16\mathrm{.}2\mathrm{.}1.$ Then show and capture again the routing table$\mathrm{.}6.$ Try again the tracert $10\mathrm{.}10\mathrm{.}10\mathrm{.}254$ command, which should be successful, and capture a screenshot$\mathrm{.}7.$ Another way of adding a default route is telling the device to drop the packet in the right interface, instead of using the IP address of the router. Using a similar command as the one in Border$1,$ add the default router in Border$2.$ Capture a screenshot of the command you used and the routing table$\mathrm{.}8.$ What method $($IP address or interface$)$ is best suited for a complex network in which multiple routers in the same segment could lead to different networks? Why?$9.$ Capture a successful ping from PC$1$ to the DNS Server.Section B: Adding static routesDrag & 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 $172\mathrm{.}16\mathrm{.}5\mathrm{.}1/24\mathrm{.}10.$ The PC$2$ should be able to ping WestBuilding in the FastEthernet$0/0$ interface but not Border$2$ in the FastEthernet$0/1$ interface. Where the response for the second ping was sent through?$11.$ You will need static routes in Border$2$ that inform how to get to the new network segment beyond WestBuilding. What is the network ID in CIDR notation for the segment to which PC$2$ belongs? What nearest IP address would be the next hop or router in packets going to this network?$12.$ Enter the privileged exec mode in Border$2$ and add a static route with the command ip route DESTINATION$\_$NETWORK MASK NEXT$\_$HOP properly adapted to your lab. Capture a screenshot showing the command you used and the new routing table$\mathrm{.}13.$ Check out the settings in Config tab Static. Considering the route previously added and the new one, what are the two possible options in the command ip route after the network mask?$14.$ Try again pinging $172\mathrm{.}16\mathrm{.}4\mathrm{.}2$ from PC$2.$ Capture a screenshot$\mathrm{.}15.$ Try tracert $172\mathrm{.}16\mathrm{.}5\mathrm{.}3$ from PC$0.$ What hops is the packet following?$16.$ Click on the envelope Add simple PDU on the right. Next, click first on PC$0$ and then on PC$2.$ Then, click on the simulation mode on the bottom right of the screen. Finally, click on Play in the Play Controls section. Focusing on the ICMP packets, there is a change in the colors, being the router ISP the first in changing the color. What does it mean? What do you think is missing in the routers configuration? You cannot fix it because ISPs configuration is locked$\mathrm{.}17.$ 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$\mathrm{.}18.$ Capture a screenshot of WestBuildings routing table.