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Graphics Interchange Format  |  1998-10-01  |  27.4 KB  |  480x305  |  4-bit (15 colors)
   ocr: Packet Filter:OSIModel Application Application presentation Presentation sessioa Parsetsre Session arospeeoe rransport AVENSES Transport Network Network Netvork Data link Data ink Datalink Paysical Physical Physical Figure 2 A packet filter examines packets at the Network layer, independently of the application. This allows them to provide: very fast perrormance, but at the risk: of application-level attacks that would go undetected.