单选题You have been tasked with setting a trust boundary on the Company network. What is the basic function of this trust boundary？（）A Trust boundaries are points in the network where Layer 2 CoS markings are converted to Layer 3 DSCP or IP precedence markings.B Trust boundaries are a point in the network where QoS functionality begins and ends.C Trust boundaries determine whether certain types of traffic can pass.D Trust boundaries are a point in the network where decisions about CoS markings on incoming packets are made.E None of the other alternatives apply
单选题
You have been tasked with setting a trust boundary on the Company network. What is the basic function of this trust boundary？（）
A
Trust boundaries are points in the network where Layer 2 CoS markings are converted to Layer 3 DSCP or IP precedence markings.
B
Trust boundaries are a point in the network where QoS functionality begins and ends.
C
Trust boundaries determine whether certain types of traffic can pass.
D
Trust boundaries are a point in the network where decisions about CoS markings on incoming packets are made.
E
None of the other alternatives apply
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