单项选择题

Which of the following operates in the 2.4GHz range and has a MAXIMUM distance of 10 meters (33 feet)?（）

A.x-10
B.Bluetooth
C.802.11a
D.802.11b

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单项选择题

Which of the following describes an area where communications equipment is stored?（）

A. HVAC
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C. 110 block
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单项选择题

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A. Frequency settings should be changed
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Which of the following is required if ports from VLANs on two separate switches need to broadcastto each other?（）

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