In recent years the firewall is one kind of protection computer network security technical measure which develops, is also uses the most widespread one kind of network security to protect the technology at present. The firewall is or a group implements the access control strategy the system, it may be the software, the hardware or software and hardware's union, its goal is provides to the network safekeeping of security. The firewall usually is located at between the internal network and the exterior network, may monitor, the control and the change the network service which flows between the interior and the exterior network; Controls the exterior computer to be possible to visit the interior the environment which protects, and determined the visit the time, the jurisdiction, the service type and the quality and so on, the inspection interior spreads the information, avoids the privacy information flowing out, achieves resists exterior invades and prevents the goal which the insider information divulges a secret. This article proposed firewall's disposition in network security's importance, has explained the firewall ruleset is the firewall product security important measure.
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