单选题Which of these is a valid differentiated services PHB？ （）AGuaranteed PHBBClass-Selector PHBCReserved Forwarding PHBDDiscard Eligible PHBEPriority PHB
单选题
Which of these is a valid differentiated services PHB？ （）
A
Guaranteed PHB
B
Class-Selector PHB
C
Reserved Forwarding PHB
D
Discard Eligible PHB
E
Priority PHB
参考解析
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