单项选择题
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
多项选择题 You have configured voice VLANs on Catalyst switch R1. Which two statements are true about the operation of voice VLANs on this device？ （）
单项选择题 Refer to the exhibit. Which statement is true about the configuration that is shown？ （）
单项选择题 The Company network administrator has entered the "auto qos voip cisco-phone" command on switch R1. What does this command do？（）
