ChoosethetruestatementregardingQoSpre－classify.()
A.QoSpre-classifypermitsmakingQoSdecisionsbasedonelementsfromtheunencryptedIPpacket.
B.QoSpre-classifyisrequiredwhenencryptingvoice.
C.QoSpre-classifyisanadvantagetoServiceProviderstransportingencryptedpackets.
D.QoSpre-classifyisnotdesignedforIPSec/GREconfigurations.
正确答案：参考A
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