Download Cisco Packet Tracker from the list of tools and install it either in your computer or in a Windows virtual machine$\mathrm{.}1.$ Drag & drop $4$ switches Cisco Catalyst $2960$ and name them SW$1$ to SW$4.$ Connect every switch with the next one until you complete a loop. The STP will be automatically configured so that all interfaces are up but one. Why?$2.$ Identify the switch with the interface down in orange. Execute the command sh spanning$-$tree on it and capture a screenshot. The section Root ID shows information about the chosen root bridge $($the main switch in the STP topology$).$ The section Bridge ID shows information about the switch from which the command was executed$\mathrm{.}3.$ The switch on the other end will be the one selected as root bridge. Execute the command sh spanning$-$tree on it and capture a screenshot$\mathrm{.}4.$ What the main differences are in the interfaces summary of both switches?$5.$ Connect $4$ computers named PC$1$ to PC$4$ with IP addresses $192\mathrm{.}168\mathrm{.}0.$X$,$ where X$=$PC#$,$ to the respective switches, matching the numbers. Try pinging PC$1$ and PC$2$ from PC$3,$ which should work, and capture a screenshot$\mathrm{.}6.$ To change the root switch, you must execute spanning$-$tree vlan $1$ root primary in the chosen switch. Do it in the switch with the orange interface and explain what happened$\mathrm{.}7.$ Using the PT Simulation, add a simple PDU from one PC to another so that it must be forwarded through an alternate path to the interface in orange, even if it was not the shorter one. Write down the switches it passed through. Tip: make sure you focus on ICMP, because there will also be ARP, STP and other packets on the network$\mathrm{.}8.$ Wait for the simulation to show the status Successful at the bottom. Then, change from Simulation to Realtime. In the switch with an interface in orange, execute sh spanning$-$tree and bring down the interface with role Root. Capture a screenshot of the commands$\mathrm{.}9.$ Then, wait for some $60$ seconds until the STP packets automatically reconfigure the topology. What happened with the interface in orange?$10.$ Execute the command sh spanning$-$tree on the switch that had this interface in orange. What is the difference in the summary regarding the status?$11.$ Run the simulation again and write down the new path. Was this path as long as in the previous simulation?$12.$ Bring up again the interface. Then, create a double loop connecting all switches. You might need to wait $60$ seconds for STP to reconfigure the topology. Capture a screenshot of the result $(5$ interfaces should be in orange$).$