单项选择题
A.It disables the trust boundary feature because the switch knows a Cisco IP phone is attached.
B.The switch assigns a CoS value of 5 to incoming packets.
C.If a Cisco IP phone is attached and removed， the switch continues to trust the CoS values as long as the switch is not rebooted.
D.It turns on STP to see if a Cisco IP phone is attached.
E.If a Cisco IP phone is attached， the switch trusts the CoS.
F.None of the other alternatives apply.
多项选择题 Refer to the exhibit. Which three statements are true about the voice VLAN configuration of the Catalyst switch？ （）
多项选择题 The Cisco AutoQoS feature is being used throughout the Company VOIP network. Which three statements about this feature are true？（）
单项选择题 Refer to the exhibit. What is the effect on the trust boundary of configuring the command mls qos trust cos on the switch port that is connected to the IP phone？（）