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Assignment 1 - 2020 (SCTP) Co py rig ht © 20 20 M ac qu ari e U niv ers ity. Al l ri gh ts res erv ed . No pa rt o f th is d oc um en t m ay be re pro du ce d, sto red in a ret rie va l sy ste m or tra ns mi tte d i n an y f orm by an y m ea ns el ec tro nic , m ec ha nic al, ph oto co py ing , re co rdi ng or ot he rw ise , wit ho ut the pr ior w ritt en pe rm iss ion of M ac qu ari e U niv ers ity. COMP6250 Data Communications Assignment 1 Session 2, 2020 Due: Friday 11th September, 2020, 11:55 pm (Last day of classes before the mid-semester break) Marks: 60, Value: 15% This assignment is designed to help you develop skills and strengthen your understanding of data communications. Ensure that you read and adhere to the following instructions: When answering Q1, layout your answer in a readable format and include all relevant working. Your answers to Q2 will require supporting arguments and references that cite your research, since this is a networking unit you should use IEEE referencing style. Your assignment will be submitted electronically via TurnItIn on the COMP6250 iLearn page. Ensure that you adhere to the following requirements: • All submissions must be in PDF format -- do not submit a MS-Word file. • Do not include a cover sheet of any kind. • Do not include the text of any of the questions in your submission. • Do not use double-spacing. • Use a sensible, clean font, 10-12 pt in size. • Hand-written or scanned submissions will not be accepted. • Your report should not exceed 10 pages. Failure to follow any of the above requirements will result in a loss of marks. https://ieee-dataport.org/sites/default/files/analysis/27/IEEE%2520Citation%2520Guidelines.pdf Co py rig ht © 20 20 M ac qu ari e U niv ers ity. Al l ri gh ts res erv ed . No pa rt o f th is d oc um en t m ay be re pro du ce d, sto red in a ret rie va l sy ste m or tra ns mi tte d i n an y f orm by an y m ea ns el ec tro nic , m ec ha nic al, ph oto co py ing , re co rdi ng or ot he rw ise , wit ho ut the pr ior w ritt en pe rm iss ion of M ac qu ari e U niv ers ity. Question 1 (30 marks) – Subnetting You work as a junior network administrator and you have been tasked by the senior network administrator to re-number the company’s internal networks. The company is organised as follows. The address space you have been given to work with is 172.23.64.0/18. Devise a subnetting scheme to efficiently accommodate this structure that also allows for some future growth in the number of locations, the number of departments in each location, and the number of staff within each department. For each subnet you need to provide the following details: • network address • broadcast address • netmask • maximum number of hosts per subnet Location Department Staff Sydney Head Office Administration 39 Accounts 67 Human Resources 43 Engineering 107 Sales 283 Marketing 174 Executive Team 5 Reception 7 Melbourne Branch Administration 27 Sales 21 Marketing 159 Engineering 99 Reception 3 Singpapore Branch Administration 46 Sales 91 Marketing 65 Engineering 226 Executive Team 1 Reception 2 Co py rig ht © 20 20 M ac qu ari e U niv ers ity. Al l ri gh ts res erv ed . No pa rt o f th is d oc um en t m ay be re pro du ce d, sto red in a ret rie va l sy ste m or tra ns mi tte d i n an y f orm by an y m ea ns el ec tro nic , m ec ha nic al, ph oto co py ing , re co rdi ng or ot he rw ise , wit ho ut the pr ior w ritt en pe rm iss ion of M ac qu ari e U niv ers ity. Question 2 (30 marks) – Research The role of the transport layer is two-fold: 1.To provide a communications end point so that packets delivered to a host will be given over to the correct process running on the host. 2.To potentially provide additional services or different delivery semantics than that provided by the network layer. In October 2000 SIGTRAN (the IETF Signaling Transport working group) introduced a new transport layer protocol called the Stream Control Transmission Protocol (SCTP). a) What functionality does SCTP offer that is provided by neither UDP nor TCP? b) What functionality does SCTP provide that is offered by either TCP or UDP? c) Perform some research to find a case of an application where SCTP is utilised. i. Briefly describe the application’s transport layer requirements. ii. Describe how SCTP functionality fulfils these requirements. Your answer should include an explanation as to why use of this less well known transport protocol is worthwhile. iii. If SCTP was not available, briefly explain how the application architecture could be modified so that it could work over either TCP or UDP. (Hint: think about which layer certain functionality would need to be located if using TCP or UDP instead of SCTP). d) In spite of any perceived benefit, SCTP is not widely used. Why do you think this is? Co py rig ht © 20 20 M ac qu ari e U niv ers ity. Al l ri gh ts res erv ed . No pa rt o f th is d oc um en t m ay be re pro du ce d, sto red in a ret rie va l sy ste m or tra ns mi tte d i n an y f orm by an y m ea ns el ec tro nic , m ec ha nic al, ph oto co py ing , re co rdi ng or ot he rw ise , wit ho ut the pr ior w ritt en pe rm iss ion of M ac qu ari e U niv ers ity. Assessment For all questions in this assignment not only content but also presentation will affect your mark. You will lose marks if there are problems with the presentation, particularly with clarity. This means that your answers to each question should be a coherent statement and that the spelling and grammar of your submission will be taken into account in assessing its presentation. For full marks, your answers should be well argued, clear, and coherent. The standards of marking described in the unit outline L.O. 1 and L.O. 2 will be applied to this assignment as relevant to the assignment topics. In addition, the following particular standards will be applied in marking this assignment: • Spelling and grammar: o Assignment submissions with more than 4 spelling or grammatical errors will not achieve a grade higher than distinction; submissions with more than 8 such errors will not achieve a grade higher than credit. • Clarity: o Ambiguous or poorly worded answers will receive a grade no more than a pass for the individual question. o Minor issues of clarity will receive a grade no more than credit for the individual question. • Correctness of approach taken and answer obtained: o Incorrect answers with the correct logic or approach will receive no more than a pass for the individual question. o Correct answers with incorrect logic or approach will receive no more than pass for the individual question. o Incorrect answers with no explanation of the approach taken or with the incorrect approach will receive a fail grade for the individual question. The questions will be marked individually, the marks totalled, and a final grade assigned that is no more than indicated by the total marks, and no more than allowed by the standards specified above and in the unit outline. Submission Submit on the iLearn page under ‘Assignments Section’. The submission is with a tool called TurnItIn. This cross checks for online papers and other student papers for any plagiarism (copying). In short – DON’T COPY – or get others to do your assignment, we are pretty good at catching people out and the consequences can be severe. Do not trust anyone who will take money to do assignments. They can take money from several students, return the same assignment, and you get caught. They don’t care about you, but we do! Question 1 (30 marks) – Subnetting Question 2 (30 marks) – Research Assessment