单项选择题

Which certification-based protocol is implemented for wireless QoS between an AP and a wireless client over RF media？（）

A.WMM using DCF
B.WMM using EDCAF
C.802.1e using DCF
D.802.1e using EDCAF

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多项选择题

Which two statements about the open and shared key wireless-authentication methods are true？（）

A.shared key authentication is considered more secure than open authentication
B.shared key authentication is considered less secure than open authentication
C.if the WEP keys do not match using the open authentication method， the client will not authenticate， associate， and transfer data
D.if the WEP keys do not match using the open authentication method， the client will still be able to authenticate and associate， but will not transfer data
E.if the WEP keys do not match using the open authentication method， the client will still be able to authenticate， associate， and transfer data

单项选择题

Voice activity detection （VAD） suppresses the transmission of silence patterns. On average， and assuming that a link carries at least 24 calls， what percentage of total bandwidth could VAD save？（）

A.5
B.15
C.25
D.35
E.45
F.55

多项选择题

What are three features of voice traffic on a network？（）

A.bursty
B.constant
C.bandwidth intensive
D.small packet sizes
E.time-sensitive
F.retransmittable