![]() ![]() ![]() The rules defining a valid session prescribe, for example, the destination and source addresses and ports, the time of day, the protocol being used, the user and the password. circuits) at the transport layer (typically TCP connections) against a table of allowed connections, before a session can be opened and data exchanged. It checks the validity of connections (i.e. A circuit level gateway operates at the transport layer of the OSI or internet reference models and, as the name implies, implements circuit level filtering rather than packet level filtering. ![]()
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