Which three traffic descriptors are typically used as QoS markings for packets or frames entering the network？（）
- A、protocol type
- B、CoS
- C、DSCP
- D、IP precedence
- E、destination address
- F、input interface
正确答案:B,C,D
答案解析:有
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Which three traffic descriptors are typically used as QoS markings for packets or frames entering the network？（）
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