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多选题
Which two statements are true about trust boundaries？（）
A
Classifying and marking traffic should be done as close to the traffic source as possible.
B
Classifying and marking traffic should be done at the distribution layer.
C
Traffic is classified and marked as it travels through the network.
D
If untrusted traffic enters a switch， it can be marked with a new QoS value appropriate for the policy in place.
E
The trust boundary moves depending on the type of traffic entering the network.
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