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多选题
Which QoS mechanisms can you use on a converged network to improve VoIP quality？（）
A
The use of a queuing method that will give VoIP traffic strict priority over other traffic
B
The use of RTP header compression for the VoIP traffic
C
The proper classification and marking of the traffic as close to the source as possible
D
The use of 802.1QinQ trunking for VoIP traffic
E
The use of WRED
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