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Slide design: Dr. Mark L. Hornick CS2911 6 May 2019 CS2911 Week 2, Lab Today Hand out Lab 3 Checklist Hand out Practice Quiz Answer Key Lab 2: Questions? Lab 3: Parsing in Python Encoding in Python Muddiest Point Lab 2!!! SE-2811 Slide design: Dr. Mark L. Hornick Content: Dr. Hornick Errors: Dr. Yoder Dr. Josiah Yoder

CS2911 6 May 2019 Muddiest Point 1-3 Can you start including answers to your exercises so we know if we did it right? Otherwise we might be doing things wrong and have no idea Answers to exercises Nothing today:) nothing So when a browser replaces a space in a url with %20, that is a hexadecimal replacement? Hex for space SE-2811 Dr.Yoder Dr. Josiah Yoder

Questions about Lab 2? What we've discussed today CS2911 6 May 2019 Questions about Lab 2? What we've discussed today Team lab, individual report Python code in lab assignment Role of UDP in network stack How to use Wireshark! SE-2811 Dr.Yoder Dr. Josiah Yoder

Encoding Message Length CS2910 5/6/2019 Encoding Message Length Field at start of message 03 31 0d 0a Special code at end of message 31 0d 0a 00 HTTP header lines: 0d0a Predetermined size TCP header Last class: Slide 37 SE-2811 Dr.Yoder Dr. Josiah Yoder

Parsing Messages Field at start of message CS2910 5/6/2019 Parsing Messages Field at start of message Read field – you know exactly what is where Special code at end of message Keep reading until you find the code Predetermined size Read all fields – you know exactly what is where Last class: Slide 38 SE-2811 Dr.Yoder Dr. Josiah Yoder

https://www.polleverywhere.com/free_text_polls/zIp2tH2IVWjXv4H CS2910 5/6/2019 What was the muddiest point? SE-2811 Dr. Josiah Yoder Dr. Josiah Yoder

CS2911 6 May 2019 Acknowledgement This course is based on the text Computer Networking: A Top Down Approach 7th edition Jim Kurose, Keith Ross Addison-Wesley SE-2811 Dr. Josiah Yoder Dr. Josiah Yoder