1 of 4 D e p ar tm e n t o f C o m p u te r Sc ie n ce TABLE OF CONTENTS Main Objective of the assessment...

CS2005-AssessmentBrief_Task1.2019-20(2).pdf


1 of 4 D e p ar tm e n t o f C o m p u te r Sc ie n ce TABLE OF CONTENTS Main Objective of the assessment ........................................................................................................................ 1 Description of the Assessment .............................................................................................................................. 1 Learning Outcomes and Marking Criteria ............................................................................................................. 3 Format of the Assessment .................................................................................................................................... 3 Submission Instructions ........................................................................................................................................ 4 Avoiding Plagiarism ............................................................................................................................................... 4 Late Coursework ................................................................................................................................................... 4 Assessment Title Networks and Operating Systems Task 1 Module Leader Dr. Anastasia Anagnostou Distribution Date 19/11/2019 Submission Deadline 14/02/2020 Feedback by 06/03/2020 Contribution to overall module assessment 25% Indicative student time working on assessment 40 Hours Word or Page Limit (if applicable) 3000 Words (suggested) Assessment Type (individual or group) Individual MAIN OBJECTIVE OF THE ASSESSMENT The main objectives of this assessment are to (a) demonstrate that you have learnt the fundamental issues of networks and operating systems in the tutorials, (b) able to set up and test a simple network in support of this, and (c) be able to troubleshoot problems with distributed systems. These objectives satisfy the following learning outcomes of the module as re-stated below: LO1: Demonstrate understanding of the fundamental issues of networking and operating system technology. LO2: Set up and test a simple network. LO3: Assess requirements and problems that arise when a distributed system is designed and implemented. Note that LO4 will be assessed in the exam. DESCRIPTION OF THE ASSESSMENT This document gives details about the single assignment (Task 1) of CS2005 Networks and Operating Systems. Read carefully the following scenario then follow the instructions given at the end of the scenario. Scenario and Instructions for Completing the Task You are a freelance mobile app developer and you use an online marketplace, the fictional O5AppShop Platform, for managing the distribution of your apps. O5AppShop provides access to user and admin profiles. In the user profile users can buy an app. In the admin profile you can review your account. O5AppShop does not charge you for hosting your apps but keeps a percentage of each purchase. You were very satisfied with their services until recently when O5AppShop underwent a major update. After testing the transactions in your account you discovered that it does not function correctly. You contacted O5AppShop’s support but they insist that their platform works perfectly and the problem lies with the network connection. You therefore CS2005 Networks and Operating Systems Assessment/Coursework for 2019/20 2 of 4 D e p ar tm e n t o f C o m p u te r Sc ie n ce requested a clone of their client / server application before and after the update in order to test it in your test network. You need to prove to them that it is their update and not your network that is the problem! Approach You must accomplish the following tasks: 1. Set up a test network 2. Document the protocol for O5Client and O5Server 3. Document the protocol for O5ClientNew and O5ServerNew and identify any problems 4. Write a short report to the O5AppShop managers to convince them that there are indeed problems with their updated software and that need to be fixed. These are described below: 1. Set up a test network Set up the following network topology. This includes two subnets that communicate via a router. Configure the subnet IP addresses as in the figure below. The hosts’ IP addresses will be dynamically allocated by the DHCP server. Demonstrate that your network is working correctly. Do this by using ifconfig, netstat, ping, tracepath and Wireshark as indicated in the ICMP tutorial. In your report show the outputs of all five (using screenshots) and write a short description that clearly describes how each of these in combination show that your network is correctly working1. You must demonstrate that you can identify the IP addresses of the source and destination hosts and that you can send and receive packets between the hosts. 2. Document the protocol for O5Client and O5Server2 Get a copy of O5Client and O5Server from BBL. Run the client and the server as you have done in the Distributed Systems tutorial. Using Wireshark, systematically capture the protocol for all the transactions. Describe these in your report using a protocol table. 3. Document the protocol for O5ClientNew and O5ServerNew2 and identify any problems Get a copy of O5ClientNew and O5ServerNew from BBL. Run the client and the server as you have done in the Distributed Systems tutorial. Using wireshark, systematically capture the protocol for all the transactions. Describe these in your report using a protocol table as well as any problem that you have identified. 1 If the routes between the two hosts do not exist in the routing tables of the hosts, add them as in the ICMP tutorial. 2 Note that you have to capture the messages exchanged via the network (i.e. the packets payload) not the messages that are displayed on the user interface. 3 of 4