四层交换

第四层交换机区别时第三层交换机的是，它不只使用了第三层交换机中的IP交换技术，更首要的是它站在更高层次上，可以查看第三层数据包头源地址和意图地址的内容，可以通过基于观察到的信息采用相应的动作，实现带宽分配、故障诊断和对TCP/IP使用程序数据流进行访问控制的关键功能

(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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