单项选择题
Which device is used in wireless networks to send transmissions to a target area?（）
A.Optical fiber
B.Access point
C.Directional antenna
D.Omni-directional antenna
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A.Network security
B.Wireless network
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You are the network consultant from passguide.com. In which situation you will advice your customer to implement data centers?（）
A.Protecting the business from information outages
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A.Synchronizes password exchanges for call setup
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D.Creates an encrypted tunnel for voice through a Transmission Control Protocol (TCP)/IP network
