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OCR: Stateful Inspection Application Application Application Presentation Presentation Presentation Session Session Session Transport transport Transport Network Network Network Data Link Data Link Data Linik Physical Physica Physical Figure 2. Stateful-inspection firewalls can intelligently track packets and sessions that occur- between a client and server. These types of firewalls inspect packets at the Network layer and take information needed to make security decisions. This information is kept and used for future connection attempts.