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->Dst can 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/ russia-victory-day-parade-t1-main.jpg. Describe the DNS translation steps
Describe the issues raised to CDN, if we use 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