单项选择题
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
单项选择题 Refer to the exhibit. On basis of the configuration that is provided， where will the trust boundary be established in this network？ （）
多项选择题 You need to determine where the trust boundaries will be in a new Company VOIP design. Which two statements are true about these trust boundaries？（）
单项选择题 Refer to the exhibit. Based upon the information that is given， how will voice traffic from the phone and data traffic from the PC be handled by SW_1？ （）