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UDP-1 Lab: Q01.1 Finding a UDP segment to study. The trace file dns-wiresh...
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UDP-1 Lab: Q01.1 Finding a UDP segment to study. This LMS module allows you to enter answers for the questions posed in the Wireshark UDP lab v8.1 writeup that accompanies the textbook Computer Networking: A Top-down Approach, 8th edition. The Wireshark lab description, questions, context, helpful hints, and more are in the UDP Wireshark Lab Writeup. So that writeup is a must-read, before answering these questions. The answers to the questions in this LMS module (which match those in the Wireshark lab writeup) are based on packets in the trace files dns-wireshark-trace1-1 (pay careful attention to the '-1' in the filename) that can be extracted from the zip file http://gaia.cs.umass.edu/wireshark-labs/wireshark-traces-8.1.zip So make sure you have this specific trace file open in Wireshark when you answer these questions! | Image failed to load: 8E cover |
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UDP-1 Lab: Q01.1 Finding a UDP segment to study.
The trace file dns-wireshark-trace1-1 contains packets sent and received in retrieving the web page http://gaia.cs.umass.edu/kurose_ross. The web page fetch will require resolving the name gaia.cs.umass.edu, which in turn will invoke the DNS protocol, which will use the UDP protocol. Our focus here will be on UDP segments, not the DNS or HTTP protocol messages.
Locate the first UDP segment (hint: type in 'dns' (lower case and without the quotes) into display filter and select the first packet). What is the packet number[1] in the trace for this UDP segment?
[1] Remember that this “packet number” is assigned by Wireshark for listing purposes only; it is NOT a packet number contained in any real packet header.