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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.
In the Open Systems Interconnection (OSI) communications model, the application layer provides services for an application program to ensure that effective communication with another application program in a network is possible. The application layer is not the application itself that is doing the communication.