多项选择题
A.switchport voice vlan vlan-id
B.mls qos trust device cisco-phone
C.switchport priority extend cos_value
D.mls qos trust cos
E.mls qos trust override cos
多项选择题 Refer to the exhibit. Which three statements are true about trust boundaries in the campus network？（）
多项选择题 Refer to the exhibit. Which two statements are true about the required switch configurations to support a voice VLAN？（）
单项选择题 You have been tasked with setting a trust boundary on the Company network. What is the basic function of this trust boundary？（）