问题:
A . The DiffServ model requires applications to signal the network with QoS requirements.
B . The DiffServ model can be used to deliver QoS based upon IP precedence, or source and destination addresses.
C . The DiffServ model requires RSVP.
D . The best effort model is suitable for applications such as file transfer and e-mail
E . The IntServ model requires applications to signal the network with QoS requirements.
F . The IntServ model attempts to deliver a level of service based on the QoS specified by each packet
● 参考解析
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