A firewalls is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
There are several types of Firewall that works on different layers of the OSI models. The following are list of seven different types of Firewall that are widely used for Network Security.
1: Screened Host Firewall.
2: Screened Sub net Firewall.
3: Pocket Filter Firewall.
4: State full Inspection Firewall.
5:Hybrid Firewall.
6: Proxy Server Firewall.
7: Application Level Firewall.
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