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Question: You company provides wireless networking services. One of your customers complains about the downloading performance being poor. After 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 (100 to 200 words)
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] (400 to 600 words)
3. Explain how does the CSMA/CA in DCF handle media contention. [5 marks] (400 to 600 words)
Produce and explain a CFG to fulfill the requirement to describe a language that has an alphabet of {0,1}, starts with a 0, ends with 00.
Write a foreach loop to display the contents of bArray. Write a for loop to increment each element in bArray by 5.
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build a Perl script that accepts the name of directory as an argument to the script, and lists out the files in this directory that are older than 2 hours from the time the script is executed.
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Explain the differences between a context-level diagram and a diagram level 0.
Perform some of the changes, the WebTime example to consists of drop-down lists that enable the user to alter such Label properties as the BackColor, ForeColor and Font-Size.
How will you create a presentation that is appropriate for your audience? How do you know how many slides to add for a 10-minute presentation?
Design a polynomial time algorithm to determine which company the customer could buy each item from to minimize her total cost.
Develop the logic for a program that continuously accepts employee data and prints each employee's ID number, name, and correct hourly salary for current year.
What is the difference between the front-end and back-end processes of office automation? List down some examples in your workplace or that you come into contact with? How can the concept of front-end and back-end processes apply to other activiti..
Do you think a physical keyboard is necessary for your own computer work and creativity? What kinds of evidence would help to support your opinion?
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