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单项选择题 Refer to the exhibit.  Which Catalyst switch interface command would be used to cause the switch  to instruct the phone to override the incoming CoS from the PC before forwarding the packet to the  switch？（）

A、 mls qos cos 2 override

B、 switchport priority extend cos 11

C、 switchport priority extend trust

D、 switchport priority extend none

E、 mls qos cos 2

F、 switchport priority extend cos 2

  • F

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