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CISCO路由器的报文过滤可以让用户根据报文的源地址、目的地址以及应用类型控制流入网络的数据流。访问列表是基于将规则和报文进行匹配来允许或拒绝报文的排序表。路由器对报文的控制是按照访问列表中语句创建的顺序进行的,
CISCO router packet filtering allows users according to the source address of the packet, the destination address and application type to control the flow of data into the network. An access list is a sort table that allows or denies messages based on matching rules and messages. The router controls the message according to the order in which the statements in the access list are created.