多选题常见的IP QoS模型有（）。ABest-EffortBIntegrated ServiceCDifferentiated ServiceDFIFO Service
题目
多选题
常见的IP QoS模型有（）。
A
Best-Effort
B
Integrated Service
C
Differentiated Service
D
FIFO Service
Best-Effort
Integrated Service
Differentiated Service
FIFO Service