A circuit level gateway works at which of the following layers of the OSI Model?
A.
Layer 5 – Application
B.
Layer 4 – TCP
C.
Layer 3 – Internet protocol
D.
Layer 2 – Data link
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B
A circuit-level gateway is a type of firewall. Circuit level gateways work at the session layer of the OSI model, or as a “shim-layer” between the application layer and the transport layer of the TCP/IP stack. They monitor TCP handshaking between packets to determine whether a requested session is legitimate.
kind of bogus, since there technically isn’t a layer of the OSI model called TCP