单项选择题

What amount of cell overlap ensures smooth roaming for wireless endpoints？（）

A.5~10%
B.10 ~15%
C.15~20%
D.20~25%

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单项选择题

How many channels are defined in the IEEE 802.11b DSSS channel set？（）

A. 3
B. 4
C. 11
D. 13
E. 14

单项选择题

Which signal and noise values will result in the best phone communication with an access point？（）

A. Signal strength 0dBm， noise level 6dBm
B. Signal strength 8dBm， noise level 9dBm
C. Signal strength 4 dBm， noise level 4 dBm
D. Signal strength 6dBm， noise level 5 dBm

单项选择题

To ensure quality， what is the maximum end-to-end transit time in milliseconds on a voice network？（）

A. 50
B. 100
C. 150
D. 200
E. 250