多选题To have the best possible voice quality and to utilize effectively the available bandwidth， which queuing and compression mechanisms need to be used？（）Aclass-based weighted fair queuing （CBWFQ）Blow latency queuing （LLQ）Cpriority queuing （PQ） or custom queuing （CQ）DReal-Time Transport Protocol （RTP） header compressionETCP header compressionFUDP header compression
多选题
To have the best possible voice quality and to utilize effectively the available bandwidth， which queuing and compression mechanisms need to be used？（）
A
class-based weighted fair queuing （CBWFQ）
B
low latency queuing （LLQ）
C
priority queuing （PQ） or custom queuing （CQ）
D
Real-Time Transport Protocol （RTP） header compression
E
TCP header compression
F
UDP header compression
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