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多选题
Which two Cisco AutoQoS configuration statements are true? ()
A

the auto discovery qos command is supported on serial interfaces, subinterfaces, and virtual interfaces

B

CEF must be enabled before configuring the auto discovery qos command

C

the auto discovery qos privilege EXEC command must be configured on a router for several days to collect a sampling of data traffic

D

the auto qos trust command relies on NBAR to provide VoIP classification

E

the auto qos voip command configures the voip classification on routers and switches


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