Types of firewalls

Other types of firewalls include packet-filtering firewalls, stateful inspection firewalls, proxy firewalls and next-generation firewalls (NGFWs).

• A packet-filtering firewall examines packets in isolation and does not know the packet's context.
• A stateful inspection firewall examines network traffic to determine whether one packet is related to another packet.
• A proxy firewall (aka application-level gateway) inspects packets at the application layer of the Open Systems Interconnection (OSI) reference model.
• An NGFW uses a multilayered approach to integrate enterprise firewall capabilities with an intrusion prevention system (IPS) and application control.
• A personal firewall is a software used to protect a single internet-connected computer from attacks, as opposed to a multitude of devices.

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