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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？（）

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

  • D

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