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Recitation

Recitation. Active vs. Passive. Active vs. Passive measurements. Explain what they are Describe an active measurement experiment that measures something that can not be measured by passive approaches

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Recitation

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Presentation Transcript

  1. Recitation

  2. Active vs. Passive • Active vs. Passive measurements. Explain what they are • Describe an active measurement experiment that measures something that can not be measured by passive approaches • Describe a passive measurement methodology that measures something that can not be measured by active approaches

  3. Traceroute • Explain how traceroute works. Explain why we sometimes send UDP and not ICMP packets. • One traceroute experiment gave us the following graph: Src->L->A->D->D->Dst. Do you notice the circle in D? Why is there? • Descrribe how the graph Src->L->C->B->Dstcan be acquired from the topology above A B Src L D Dst C

  4. DNS • What is DNS? How is it used? • How can we use DNS to implement Content Delivery Networks? • CNN website contains the following URLhttp://i2.cdn.turner.com/cnn/dam/assets/140509111657-russia-victory-day-parade-t1-main.jpg. Describe the DNS translation steps • Describe the issues raised to CDN, if we use 8.8.8.8 as DNS server

  5. Packet switching • Describe the differences between packet switching and circuit switching • Why is packet switching better? • Why didn’t telephone use packet switching?

  6. Packet loss • You’d like to find the packet loss in each link of a network. How can you do it? A B C

  7. Packet Dispersion • Explain how to use packet dispersion to measure bottleneck link capacity

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