The Official (ISC)2 CISSP CBK Reference by Deane Arthur J.;Kraus Aaron; & Aaron Kraus

Author:Deane, Arthur J.;Kraus, Aaron; & Aaron Kraus [Deane, Arthur & Kraus, Aaron]
Language: eng
Format: epub
Publisher: John Wiley & Sons, Incorporated
Published: 2021-09-08T00:00:00+00:00

Types of Firewalls

There are four basic types of firewalls:

Static packet filtering firewalls

Application-level firewalls

Stateful inspection firewalls

Circuit level firewalls

The key differentiator between all four firewall types is the OSI model layer at which each operates.

Static Packet Filtering Firewalls

The first, a static packet filtering firewall, is the earliest and the simplest of firewall designs. Also called a screening router, the packet filtering firewall is the fastest design. Operating at the OSI model's network layer (layer 3), it inspects each packet. If a packet breaks the established rules, the packet is dropped and/or logged. Able to work most quickly, a packet filtering firewall will mitigate the risk of a particular packet type. This type of firewall offers no authentication mechanism and can be vulnerable to spoofing.

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