1. How long did it take from when the HTTP GET message was sent until the HTTP OK reply was received? Analyze the flowing selected packet? Answer the following questions for the TCP segments the packet trace tcp-etherealtrace-1 in http://gaia.cs.umass.edu/ethereal-labs/ethereal-traces.zip a. Use the Time-Sequence-Graph(Stevens) plotting tool to view the sequence number versus time plot of segments being sent from the client to the gaia.cs.umass.edu server. Can you identify where TCPs slow start phase begins and ends, and where congestion avoidance takes over? Note that in this real world trace, not everything is quite as neat and clean that the y-axis labels for the Time-Sequence-Graph(Stevens) plotting tool. b. Start up your web browser. Go the http://gaia.cs.umass.edu/ethereal-labs/alice.txt and retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer. Next go to http://gaia.cs.umass.edu/ethereal-labs/TCP-ethereal-file1.html. c. Use the Browse button in this form to enter the name of the file (full path name) on your computer containing Alice in Wonderland (or do so manually). Dont yet press the Upload alice.txt file button. Now start up Wireshark and begin packet capture (Capture- >Start) and then press OK on the Wireshark Packet Capture Options screen (well not need to select any options here). d. Returning to your browser, press the Upload alice.txt file button to upload the file to the gaia.cs.umass.edu server. Once the file has been uploaded, a short congratulations message will be displayed in your browser window. Stop Wireshark packet capture. Your Wireshark window should look similar to the window shown below. Part b. (15) By using Wireshark monitoring tool, capture the outgoing and incoming packets of ARP.

Question 2 CLO# 3 PLO# 2 C4 (Analyze) (30Marks) Use the Wireshark/Ethereal to perform the following tasks. 1. Capture the DHCP stream and indicate what is the link-layer (e.g., Ethernet) address of your host? Also draw a timing datagram illustrating the sequence of the first four-packet Discover/Offer/Request/ACK DHCP exchange between the client and server. 2. You are sending a query to https://www.edx.org/, write a command for a type-NS record to the default local DNS server. Part 2. Use Packet Tracer and create the following networks. Make sure successful transmission of packets in all networks? (Take Screenshot to verify) [5+5+5] a. Network A, consists of computer A, B, C, D and connected with Switch and Web Server b. Network B, consists of computer E, F, G, H and connect with Network A via Switch c. Network C, consists of computer I, J, K, L, connected with Switch and Web Server and connect with Network A and B via router. d. Query the Web Server of Network A and Network C from any three computers nodes of overall networks.