单项选择题
A.Effectively the trust boundary has been moved to the IP phone.
B.RTP will be used to negotiate aCoS value based upon bandwidth utilization on the link.
C.The switch is rewriting packets it receives from the IP phone and determining theCoS value.
D.The switch will no longer tag incoming voice packets and will trust the distribution layer switch to set theCoS.
E.The host is now establishing theCoS value and has effectively become the trust boundary.
单项选择题 Refer to the exhibit. Which switch interface configuration command would automatically configure quality of service （QoS） for voice over IP （VoIP） within a QoS domain？ （）
单项选择题 Refer to the exhibit. A trunk link is connected between switch A_SW and switch D_SW. Based on the configuration shown in the exhibit， how would the traffic coming from the switch A_SW be managed？（）
单项选择题 The Company network is displayed in the following topology exhibit： Workstation 1 traffic is set for cos 5 and the switch CompanyA sends workstation 1 traffic to the switch CompanyB. However， not all of the traffic from Switch CompanyA is from workstation 1. Switch CompanyA configurations Switch CompanyB Configuration： mlsqos mls qos interfacefa0/1 interface fa0/1 switchportmode trunk switchport trunk mode switchporttrunk encapsulation dot 1q switchport trunk encapsulation dot 1q switchporttrunk native vlan 1 switchport trunk native vlan 1 Frames from Workstation 1 are given the rightful priority through Switch CompanyA， but Switch CompanyB doesn’t reciprocate， and treats Workstation 1 frames as if they have no precedence. Which of the following actions will prioritize traffic from Workstation 1？（）
