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)