Application-level Firewall that, generally, it is the proxy server host is run, this type of firewall can provide a detailed audit report and can enforce the security policy network-level firewall firewall than this category, but it will have a less than transparent firewall level network users will need to set their machines to use this type of firewall. Additionally, the firewall will have less speed, network-level firewall, some sources mention firewall stateful inspection is a category three category filtering, which is used to consider the content of the earlier packets in the packet, that decision is considering.
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