单项选择题
A. QoS classified at layer 3 using IP precedence or DSCP.
B. Guaranteed rate service.
C. Implemented using FIFO queues.
D. All traffic has an equal chance of being dropped.
多项选择题 The Company is rolling out Cisco’s Architecture for Voice， Video and Integrated Data （AVVID）. Which of the following choices represent the fundamental intelligent network services in Cisco’s AVVID？ （）
单项选择题 Refer to the exhibit. What is the effect when the switchport priority extend cos 3 command is configured on the switch port interface connected to the IP phone？（）
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？（）