COMP247 Data Communications Assignment 2,

Question # 40123
  • Computer Science
    10 months ago
    $25

    COMP247 Data Communications
    Assignment 2, 2016
    Due: Tuesday 31st May, 2016, 6 pm
    Marks: 60
    Value: 15%
    This assignment is designed to help you develop skills and strengthen your
    understanding of data communications. Answer the questions as if they are a
    professional presentation to a client. Thus justify what you say in terms of what will
    work well for the client. Your submission should be around 5 to 10 pages, but be
    succinct. Your assignment will be submitted electronically as below with TurnItIn
    on the COMP247 iLearn page.
    Before doing assignment 2, please read the Assignment 1 Comments and the
    following Assignment Typography document in 14 Assignment Specifications on
    the COMP247 iLearn page. You will lose marks if these guidelines are not followed
    – or to put it more positively, these guidelines are to help you get the best marks.
    Question 1 (20 marks) – Physical Layer
    Part A We presented four impairments to physical transmission of signals – attenuation,
    noise, attenuation distortion, and delay distortion. How will these affect the guided media
    of copper wires and optical fibre cable, and wireless media? Suggest some techniques that
    are used at the physical layer to counteract these effects (that is ignore techniques like error
    detection and correction used at higher layers).
    Part B Consider again the above three media, but in this case how does security affect
    these media and again what physical measures can be taken to secure these media.
    Question 2 (20 marks) – Wireless LAN
    Boojum Enterprises intends letting their workers bring their own device (BYOD) to work,
    so that workers can use a device that they are personally comfortable with. The office
    measures 50 metres by 20 metres. It is already serviced by a 1000Base-T Ethernet LAN.
    What would you recommend for a wireless LAN installation? What 2016 802.11
    technology would you recommend? How many access points are required and how would
    they be positioned for the particular version of 802.11 you have chosen?
    Question 3 (10 marks) – Backbone Networks
    A backbone network can be constructed as a switched backbone, a routed backbone or a
    VLAN backbone. Each of these approaches has its advantages and disadvantages.
    a) (6 marks) Discuss the advantages and disadvantages of each approach. [Up to 400
    words]
    b) (2 marks) Describe an example of a situation where a switched backbone would be
    preferred. [Up to 150 words]
    c) (2 marks) Describe an example of a situation where a VLAN backbone would be
    preferred. [Up to 150 words]
    Question 4 (10 marks) – Data Link Layer
    a) (2 marks) Senders and receivers have agreed to use even parity. Acting as a sender, add
    a parity bit to the following bit sequences.
    010
    01100
    011010
    01100100
    b) (2 marks) Senders and receivers have agreed to use odd parity. Are the following
    received bit sequences correct?
    1001
    010101
    0110110
    011101101
    c) (3 marks) An ASCII transmission scheme uses DLE STX control characters to start a
    frame and DLE ETX to end a frame. Using character stuffing (hint: only DLE needs to
    be escaped), what are the ASCII sequences to transmit the following data streams?
    ABCD
    AB DLE STX CD
    ABC ETX DLE D ETX
    d) (3 marks) A bit-oriented protocol uses the flag bits 01111110 to start and end the frame.
    What will be the transmitted frames for the following streams of bits?
    01010111000
    01111110
    00001110111110000111111111111110000
    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 all be correct, clear, and coherent.
    The standards of marking described in the unit outline L.O. 1 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!
    Please do not include text of questions – TurnItIn reports this as copied text.

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