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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.
The top layer in the stack, the Application layer is where the end-user applica-. tion resides. Think of the Application layer as the browser application or email. client for a user surï¬ng the Web or sending email. Many protocols are deï¬ned. for use at the Application layer, such as HTTP, FTP, SMTP, and Telnet. In content switching terms, Layer 7 refers to the ability to parse information. directly generated by the user or application in decision making, such as the URL. typed by the user in the Web browser.