[单选]
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？（）

A . Effectively the trust boundary has been moved to the IP phone
B . The host is now establishing the CoS value and has effectively become the trust boundary
C . The switch is rewriting packets it receives from the IP phone and determining the CoS value
D . The switch will no longer tag incoming voice packets and will trust the distribution layer switch to set the CoS
E . RTP will be used to negotiate a CoS value based upon bandwidth utilization on the link

At a certain customer’s site， a NAS is logically in the traffic path but not physically in the trafficpath. The NAS identifies clients by their IP addresses. In which access mode has this NAS beenconfigured to operate？（） Layer 2 Edge mode。 Layer 2 Central mode。 Layer 2 In-Band mode。 Layer 3 mode。试述“新熊彼特学派”对熊彼特创新理论的批评和创新的典型化事实。某企业2006年利润为250000元，2007年的经营杠杆系数为2，如果2007年的销售变动率为5%（10分）要求：请预测在销售量变动后2007年的利润变动率以及利润变动额。 “设备和装置的结构不良，强度不够，零件磨损和老化”而导致事故，对应的事故原因构成要素归属于（）人的不安全行为。物的不安全状态。环境的不安全状态。管理上的原因。下列情况中，会导致往复泵抽空的是（）油品温度太高。开泵前未关出口阀。系统压力高。活塞间隙过大。

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？（）

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[单选] 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？（）

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[单选]
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？（）