多选题Which two statements about the best effort model for QoS are true？（）Adelay sensitive packets are given preferential treatmentBthe default policy identifies a delay sensitive class and default classCthe default policy identifies a delay sensitive class， best effort class， and default classDthe model is highly scalableEthe model is still predominant on the internet F the model provides guaranteed service
多选题
Which two statements about the best effort model for QoS are true？（）
A
delay sensitive packets are given preferential treatment
B
the default policy identifies a delay sensitive class and default class
C
the default policy identifies a delay sensitive class， best effort class， and default class
D
the model is highly scalable
E
the model is still predominant on the internet F the model provides guaranteed service
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