Circuit level gateway firewall works in Sesion Level of OSI models and there si no answer matching to this. From the TPC/IP perspective this is transport layer
A circuit-level gateway operates at the transport layer (Layer 4) of the OSI model. It works by monitoring the TCP handshaking between packets to determine whether a requested session is legitimate.
Circuit-level gateways works between the application layer and the transport layer of the OSI model but its main work is to monitor TCP handshaking between packets to determine whether a requested session is legitimate. Hence Layer 4 is the most closet option.
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