单项选择题

What is a drawback to using the IntServ model？（）

A.RSVP that signals QoS requests per individual flow
B.not scalable to large implementations
C.admission control not supported
D.use of dynamic port numbers
E.UDP not supported

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单项选择题

What is the best description of serialization delay？（）

A.the time it takes for a Layer 3 switch or a router to switch a packet from an inbound interface to the queue of the outbound interface
B.the time it takes for a propagate from source to destination
C.the time it takes to place a frame on the physical medium for transport
D.the time a packet resides in the outbound queue of a router

多项选择题

Which two statements about the best effort model for QoS are true？（）

A.delay sensitive packets are given preferential treatment
B.the default policy identifies a delay sensitive class and default class
C.the default policy identifies a delay sensitive class， best effort class， and default class
D.the model is highly scalable
E.the model is still predominant on the internet F the model provides guaranteed service

多项选择题

Which two statements are true about CAC？（）

A.CAC is implemented in the call setup phase to allocate bandwidth resources
B.CAC is implemented in the call maintenance phase to allocate bandwidth resources
C.CAC is utilized during the call teardown phase to ensure that all resources have been released
D.CAC uses the Cisco RSVP （Resource Reservation Protocol） Agent to integrate call-processing capabilities with the underlying network infrastructure
E.CAC is implemented in the call setup phase to determine the destination of the call