LAB_Test_Latency

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Yale University *

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May 5, 2024

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LAB | Latency Around the World Materials Needed laptop PC with Windows 10 Professional installed Internet connection Activity Background In this class, you learned that latency is the delay caused by the time it takes messages to travel over network media from one place to another. This concept is easy to see in the real world, where it takes longer, for example, for you to travel across the country than it does to go the grocery store. Even though network messages travel much faster than a car or a jet plane, it still takes time for them to get from one place to another. In this lab you will see how distance affects a message’s RTT (round trip time).win Steps to test latency around the world Log on to your Windows 10 laptop using your regular user account. Open a Command Prompt window and run tracert on a website whose servers are located on a different continent from you (across an ocean). If you’re located in the Eastern US, for example, you can run the command tracert london.edu (London Business School). Insert a snip of your tracert output here: Note: tracert will run for a max of 30 hops (30 routers). If the tracert command reaches your intended destination in less than 30 hops it will just stop. If tracert cannot reach the destination, you may see asterisks show in the output. These are tracert packets timing out. If you get asterisks as output up to the 30 th attempted hop, that means tracert was not able to reach the actual destination. Examine the output from tracert london.edu and find the point in the route when messages started jumping across the ocean. By what percentage does the RTT increase after the jump
compared to before it? 269.4 To calculate the percentage for this jump, you would select a time from just after the jump (229, for example) and divide it by the time from just before the jump (such as 39), then multiply by 100 to get a percentage. See the screenshot below for reference: Try the tracert command with du.ac.in (the University of Delhi in India). How many hops did it take until the route crossed an ocean? What other anomalies do you notice about this global route? about 8 We’re going to do this one more time with a website that is close to directly across the globe from us. Use the tracert command with deakin.edu.au (Deakin University in Australia). What command did you use? How many hops are in the route? Did the route go east or west around the world from your location? How can you tell? tracert deakin.edu.au , 22 , east , Its towards the East of the US Scott Base in Antarctica runs several webcams from various research locations. Run a trace to the Scott Base website at antarcticanz.govt.nz . What’s the closest router to the Scott Base’s web server that your trace reached? If you can’t tell from the command output where the last response came from, go to iplocation.net in your browser. Enter the final IP address to determine the router’s location. 120.138.19.149 Think about other locations around the world that might be reached through and interesting route. Find a website hosted in that location and trace the route to it. For example, can you find websites in China, Russia, or North Korea? Or maybe an island nation like Japan or a location in turmoil such as Iran, Iraq, or Afghanistan? Which website did you target? Where is it located? What are some locations along the route of your trace?
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