未知题型
Whatarethethreemodelsofqualityofservice（QoS）inanetwork？（）
- A.ResourceReservationProtocol（RSVP）
B.first-in，first-out（FIFO）
C.best-effort
D.CBWFQ
E.IntServ
F.DiffServ
【参考答案】
C, E, F
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