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QUESTION 17 Select the correct statement(s) regarding 802.11 WLANs. a. Operates over unlicensed ISM frequencies b. Implements spread spectrum or OFDM techniques for better noise resistance and spectral efficiency c. Uses CSMA/CA since collisions are always possible d. All of the above are correct QUESTION 18 For 802.11 WLANs, the four frame exchange protocol is implemented to help avoid the hidden node problem. True False QUESTION 19 What are ways to increase data capacity on an 802.11 WLAN? a. increase frequency bandwidth and operating frequency b. Adopt MIMO to increase bit rate and help avoid multipath fading c. implement M'ary modulation techniques d. All of the above QUESTION 20 Select the correct statement(s) regarding IEEE 802.11 WLAN MAC access. a. DCF is a contention-based access method in which data collisions can occur b. Frame exchange and four frame exchange protocols are part of the DCF method c. PCF is an optional method in which no data collisions occur d. all statements are correct

Answer 1

17.

Regarding 802.11 WLANs:

• Operates over unlicensed ISM frequencies
• Implements spread spectrum or OFDM techniques for better noise resistance and spectral efficiency
• Uses CSMA/CA since collisions are always possible

Option d

18.

For 802.11 WLANs, the four frame exchange protocol is implemented to help avoid the hidden node problem.

True

19.

ways to increase data capacity on an 802.11 WLAN:

• increase frequency bandwidth and operating frequency
• Adopt MIMO to increase bit rate and help avoid multipath fading
• implement M'ary modulation techniques

Option d

20.

IEEE 802.11 WLAN MAC access:

• DCF is a contention-based access method in which data collisions can occur.
• Frame exchange and four frame exchange protocols are part of the DCF method.
• PCF is an optional method in which no data collisions occur.

Option d