What is Application layer gateway?
An '''application layer gateway''' is a special [[Firewall (networking)|firewall]] which does [[stateful packet inspection]]. Some [[Protocol|protocols]] such as [[Thin film transistor liquid crystal display|TFTP]] use [[Port (networking)|ports]] chosen at random. An application layer gateway can strengthen such a system by only allowing communication on ports which are used by one of the [[Session (computer science)|sessions]]. Note that this setup is different from a [[proxy firewall]] (also called application layer firewall). Such a firewall will also look at the payload data being transmitted. {{tech-stub}} [[Category:Computer networking]]