多选题What are two characteristics of the DiffServ model？（）Aservice guaranteeBtraffic that is divided into classesCnot scalable to large implementationsDQoS mechanisms that are used without prior signalingEapplications that signal their particular QoS and bandwidth requirements
多选题
What are two characteristics of the DiffServ model？（）
A
service guarantee
B
traffic that is divided into classes
C
not scalable to large implementations
D
QoS mechanisms that are used without prior signaling
E
applications that signal their particular QoS and bandwidth requirements
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