(The difference between the layer 4 switch and the layer 3 switch is that it not only uses the IP switching technology in the layer 3 switch, but more importantly, it stands at a higher level and can view the source address and intent of the layer 3 packet header. The content of the address can implement key functions of bandwidth allocation, fault diagnosis and access control of TCP/IP using program data streams by taking corresponding actions based on the observed information)
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