Purpose of the assessment:
The purpose of this assignment is to allow the students to perform minor research and critical thinking on topics of UDP, TCP and ARP protocols experimentally by using Wireshark in Part A and Riverbed based network simulation in Part B. Hands-on practical experience will facilitate the students to increase the understanding of these protocols and the concept of network simulations.
You need to fully answer Part A and Part B sections
Description of the assessment:
Download and install the Wireshark software:
Go to http://www.wireshark.org/download.html and download and install the Wireshark binary for your own computer. In the labs 1-3 you have used Wireshark. (Install the same version that is installed in MIT labs)
Before working on these exercises, you may become familiar with filter expressions that are available under Frame, IP, TCP, UDP, HTTP and DNS.
NOTE – All answers should be supported by screen shots.
Use the Riverbed installation in MIT Labs for Part B.
PART A (ARP, TCP, HTTP protocols, and the Case study)
Capture ARP packets and answer the following questions:
TCP/UDP/IP Protocols [10 Marks]
In this exercise, you will need to run an application that uses UDP and an application that uses TCP. Capture the UDP and TCP packets.
Select a UDP packet and answer the following:
Select a TCP packet and display all the TCP exchanges for this TCP packet (TCP stream). Answer the following:
If the checksum validation is disabled in IP, UDP and TCP headers, how would you enable the validation?
HTTP Protocol [15 Marks]
Use a web browser to connect to any overseas based website to generate HTTP packets. Run Wireshark and capture packets for around 1-2 min. Stop Wireshark and use HTTP in the filter bar to filter only the HTTP packets.
Note – Screen shots are required for sections (b) up to (e).
Case study [20 Marks]
Performance problems have been observed in your company’s internetwork and being the network administrator of your company, your task is to do an analysis and submit a report.
Many employees have made complaints that real time multimedia applications could not be run at peak traffic hours.
The tool available for you is Wireshark.
You are aware that busy communication lines can cause variations of delays and you suspect the TCP retransmissions and duplicate ACKs can be the problem.
Your report should provide the following:
(Provide screenshots to support your answers)
PART B – Riverbed Simulation Experiments
You are a newly recruited Network Designer for a company that is specialized in network designs and you are asked to demonstrate the performance of the Switch based 10BaseT LAN against that of Hub based 10BaseT LAN.
You will use the Riverbed simulator for the demonstration. Topology of the network is 25 ethernet stations connected to the central device (i.e. Hub or the Switch). Ethernet stations are connected to the centre node with 10BaseT links. And you need to create two scenarios, one for the Hub and the other for the Switch.
Appropriate parameters need to be selected for traffic generation and packet sizes. Simulation statistics should include delay, throughput and collisions.
Your report requires the following: