In order to provide different services for different users or services, users or services can be finely divided according to the information of the packets (such as packet priority, source IP, destination IP, port number, etc.). The QoS technologies we usually use are:

In order to provide different services for different users or services, users or services can be finely divided according to the information of the packets (such as packet priority, source IP, destination IP, port number, etc.). The QoS technologies we usually use are:
A . Congestion avoidance
B . Traffic policing
C . Complex flow classification
D . Congestion management

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Answer: C