CS 125, Fall 2021
Computer Networks

Homework 2—HTTP, Mail, and DNS

Due: Wednesday, September 22, 2021 (beginning of class)

The purpose of this assignment is to give you a deeper understanding of some of the important Internet protocols. It will also give you practice in wading through RFCs. Oh, and one other thing…

Please submit your answers on paper (preferably typed and formatted with LaTeX). The due date is the beginning of class on Wednesday, September 22, 2021.

All problems from the book are taken from Chapter 2.

1. [Double points.] What is your favorite picture in Prof. Kuenning's office? (All answers are correct as long as they mention a picture that is actually there; the point is to get you to find my office and eat my candy.)
2. Problem P6. You can expect to spend a fair amount of time on this one.
3. Problem P15. Try to get away without reading the whole RFC.
4. Problem P19. The problem is formatted poorly; the root servers are named a.root-servers.net, b.root-servers.net, etc. up to m.root-servers.net. Don't just use "a"; pick one at random.
5. Problem P20.
6. Problem P21. Assume that you can use Wireshark. Then re-explain assuming that Wireshark isn't available.
7. How much time did you spend on this assignment?

© 2021, Geoff Kuenning

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