Assessment item 2 back to top Assignment 1 Value: 15% Due Date: 24-Aug-2018 Return Date: 14-Sep-2018 Length: Submission method options: Alternative submission method Task back to top Answer the...

Assessment item 2

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Assignment 1

Task

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Answer the following questions:


1. Analyse how digital convergence affects people's use of network devices? [4 marks]


2. Compare and contrast DSSS and FHSS. Which one is more suitable than the other, and for what scenario? [5 marks]


3. Research on the standard 802.15.4 and identify its MAC layer responsibilities. [4 marks]


4. According to the Shannon’s Channel capacity theorem:




Channel capacity C = B*log (1 + S/N), Where B = Bandwidth and S/N = Signal to Noise Ratio.

Answer the following questions with respect to the Channel capacity theorem: [6 marks]

a. When the Bandwidth increases, what happens?

b. When the Signal to Noise Ratio increases, what happens?

c. When the Signal to Noise Ration S/N tends to infinity what happens?

d. When the Bandwidth tends to infinity what happens?


5. Scrutinize the following scenario: [5 marks]

Consider a communications system operating in the 5.9 GHz band. Assuming the free space loss model for signal attenuation, the gain of both transmitting and receiving antenna to be 1 dB, and a noise level of -85 dBm, calculate:

a. The range of communication if the transmission power is 100mW;

b. The transmission power if you wanted a communication range of 3 Km;


6. In the questions below, please provide True or False for the statements; justify your answer with proper argument(s). (No marks for not giving the justification) [6 marks]

a. Data throughput is the same as modulation rate of the signal.

b. Frequency Diversity is achieved by spreading the signal in time by sending multiple copies of the signal at different time instants.

c. Multipath propagation always improves the SNR.

Rationale

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This assessment task will assess the following learning outcome/s:

• be able to describe wireless networking concepts and their application to real life situations.


• be able to illustrate wireless signalling techniques and describe radio frequency communications.


• be able to investigate and evaluate various wireless networking techniques, protocols and standards.


• be able to compare and contrast different wireless networks in terms of size, speed, limitations and applications.

Marking criteria and standards

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Presentation

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Please write the answers in aword documentand submit it via Turnitin. Use Times new roman/Palatino Linotype/Calibri/Cambria/Arial fonts using 10 to 12 font size.

Your answers to the questions should be precise but complete and informative. Below is a guideline about the expected length of the answers in terms of the number of words:

Question 1 to 3: 300 - 600 words for each question;
Question 4: 100 - 300 words for each part;
Question 5: no restrictions;
Question 6: 50 - 100 words for each part.

APA (Version 6) reference style should be used in the assignment. APA referencing guide can be found inhttps://apps.csu.edu.au/reftool/

Assessment item 3

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Assignment 2

Task

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Please attempt all questions:

1. In each of the following scenarios, there is a relationship to work life in the IT industry. With each of the following question, ensure that your answer includes the explanation of how it would be applied to workplace situations. Write short notes after investigating the following scenarios: [2+2+4=8 marks]

a) 802.11a supports different modulation techniques, each allowing for different data rates. This adds complexity and cost to the radio, so your boss suggests 802.11zzz should only support one modulation technique, namely the maximum data rate possible. Do you support this idea? Why or why not?

b) Your company wants to provide wireless networking services in public places, such as in an airport lounge, where a wireless networking device detects multiple wireless networks with different SSIDs. What is the use of employing an SSID mechanism, state two reasons as to why it is necessary?

c) Your company provides wireless networking services. One of your customers complains about the downloading performance being poor. After the investigation, you find that the customer’s 802.11 wireless network is interfering with his neighbour’s wireless transfers. You want to improve performance, but you do not have any control over the neighbour’s wireless connection (The only thing under your control is your customer’s wireless router). Discuss the suitability of the following strategies in achieving better performance, e.g., under what conditions could it help, and when may it not be effective.

i. Frequency Assignment - Assigning a different channel to the user’s wireless router.

ii. Power Control -- Lowering the transmit power of the user’s wireless router.

iii. Enable RTS/CTS

2. Suppose a large office building has ESS WLAN for the office users. As a network engineer, you are asked to identify the drawbacks of the ESS WLAN with respect to roaming users. What would you recommend as a remedy to this drawback, if there any? [3+3=6 marks]

3. Explain how does the CSMA/CA in DCF handle media contention. [5 marks]

4. Suppose your company is going to provide services on broadband wireless access networks. For this reason, you are asked to perform a comparative study on different technologies of wireless broadband networks. You need to complete the following table based on your study (please replace Technology T with an appropriate technology similar to WiMAX and Wi-Fi, also add few additional features in place of Feature x, y and z):[6 marks]

5. Define ‘throughput’ in regards to wireless network. Use a practical method (e.g., using an software) to measure throughput of a wireless network? You should provide any appropriate screenshots.[5 marks]

6. Suppose you work in a network security company, and you need to prepare a survey report of a particular security issue of wireless networking. To start with, select an area of wireless network security. We have listed some research papers in the 'recommended reading/resources' folder under the Resources for Students section, which can be helpful in choosing a topic. You need to use more papers in your selected topic too. This project may be done in teams of 2-3 students. Active participation in the online meeting and on the Forum will help identify like-minded team members. Please write all team members names and student IDs on the title page of the report. You may choose to work on your own as well. Please read the following information about a survey. [20 marks]

What is a survey?

The goal of a survey is to give a broad, structured overview of a specific area.

For example, suppose you are working for a company that is exploring a new wireless technology or market, so employees and management are very not very familiar with this new area. You could be asked to prepare a written report and a 30-minute presentation to introduce to area, highlighting different approaches, challenges, opportunities, and risks.

A survey is different from a set of paper summaries. The survey should focus on presenting the “big picture” using the papers as examples. For each topic, we have identified about three papers to get you started, but we generally expect that you will have to consult additional materials. Examples may be papers cited in the original papers, material found on the web, or results from online libraries, like IEEE Explorer, or the ACM portal.

Deliverable

You should submit a written version of your survey. The length should be from 1000 to 2000 words (about 3-5 pages), not including references.

There is no strict template to be followed for this report. However, you may use the following- abstract/executive summary, the importance of your security issue, state-of-the-art, how the researchers are addressing the issue, which direction the research is going, the probable future research direction, conclusion/your comments, and references.