Firewall - Types of Firewall - Advantages

Most IT professionals think there are two -- or at the most, three -- types of firewalls. Actually, there are at least five basic types: Packet-filtering firewalls operate at the router and compare each packet received to a set of established criteria (such as allowed IP addresses, packet type, port number, etc.) before being either dropped or forwarded. Circuit-level gateways monitor the TCP handshaking going on between the local and remote hosts to determine whether the session being initiated is legitim

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