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application-level gateway-Computer Definition. A proxy server that inspects packets at the application layer. However, proxy servers must be manually configured, whereas application-level gateways (ALGs) typically perform their functions automatically. See SIP ALG and proxy server.
Physical (layer 1), Data link (layer 2), Network (layer 3), Transport (layer 4), Session (layer 5), Presentation (layer 6), Application (layer 7). Below mention the functions that occur at each layer of the OSI model. Application layer: The application layer of the OSI model marks the spot where user actually communicate or interact with the computer. User application is in any form like file, print, images, messages, database, and application services. Data an application layer is in original from. Presentation layer: