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單項選擇題

If there is an existing 802.11g WLAN at a site, which service can be provided without conducting anew site survey?()

A.Add a new 802.11a WLAN
B.Increase the Layer 2 and Layer 3 security of the WLAN
C.Increase the throughput for the wireless clients
D.Add new services (such as voice) over the WLAN

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