explain all questions very clearly and do not copy from anywhere....

explain all questions very clearly and do not copy from anywhere

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QUESTION 14 Both in 802.11 PCE and DCF periods require the use of ofther the frame exchange protocol or the four frame exchange protocol True QUESTION 15 Which method is used over IEEE 802.11 WLANs to limit data collisions caused by a hidden node? D'a frame onchange protocol O b four frame exchange protocol D & DCF O d. CSMACD QUESTION 15 For ECC 802 11 WLANs, what is a mason why DSSS (direct sequence spread spectrum) and OFDM (orthogonal frequency division multiplexing) are used? Q a. FOM is preferred, but DSSS and OFDM are cheaper and easier to Implement O b. both DSSS and OFDM are rosilent in RFI environments and are spectrally efficient O c. both D555 and OFDM are considered spread spectrum technologies O d. DSSS and OFDM are methods used for either analog or digital signal transmission QUESTION 17 What are ways to Increase data capacity on an 802 11 WLAN? O a increase frequency bandeldin and or operating frequency O.b, Adopt MIMO to increase bit rate and help avoid multipath fading 3.G. implement Mary modulation techniques O d. All of the above QUESTION 18 What is the principal reason why WI-FI standards eventually adopt OFDM over CCK? Q a to Improve spectral officioncy @ b. to enable greater MIMO bit rate gains O c. because OFDM chip sets were more read y available than CCK chips God. this statement is incorrect. DSSS has overtaken OFOM as the standard of choice

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