题目内容

Choose the true statement regarding QoS pre-classify.()

A. QoS pre-classify permits making QoS decisions based on elements from the unencrypted IP packet.
B. QoS pre-classify is required when encrypting voice.
C. QoS pre-classify is an advantage to Service Providers transporting encrypted packets.
D. QoS pre-classify is not designed for IPSec/GRE configurations.

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