多选题Which three statements are true about the appliance of QoS models？（）Athe DiffServ model requires applications to signal the network with QoS requirementsBthe DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addressesCthe DiffServ model requires RSVPDthe best effort model is suitable for applications such as file transfer and e-mailEthe IntServ model requires applications to signal the network with QoS requirementsFthe IntServ model model attempts to deliver a level of service based on the QoS specified by each packet
多选题
Which three statements are true about the appliance of QoS models？（）
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 model attempts to deliver a level of service based on the QoS specified by each packet
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