單項選擇題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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1.多項選擇題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

3.多項選擇題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

5.單項選擇題Which statement is true about the distributed call control in a VoIP network？（）

A.the VoIP endpoints have the intelligence to set up and control calls
B.Call setup and control functionality is centralized in one call agent or cluster
C.Call setup and control resides in call agents that are distributed throughout the network
D.Each VoIP device has separate call control， voice packetization， and transport mechanisms

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