NETWORK SECURITY
FIREWALLS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Layer 3
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Layer 5
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Layer 7
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Layer 2
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Detailed explanation-1: -A circuit-level gateway is a type of firewall that operates on layer 5 of the Open Systems Interconnection (OSI) model, which is the session layer.
Detailed explanation-2: -–Circuit-level proxy Operates at the Session Layer of the OSI Model and makes access decisions based on address, port and protocol type, and not on the packet content. This firewall creates a circuit between the client computer and the server.
Detailed explanation-3: -Layer 5 of the OSI Model: Session Layer is the layer of the ISO Open Systems Interconnection (OSI) model that controls the dialogues (connections) between computers. It establishes, manages, and terminates the connections between the local and remote application.
Detailed explanation-4: -An application-level proxy is one that knows about the particular application it is providing proxy services for; it understands and interprets the commands in the application protocol. A circuit-level proxy is one that creates a circuit between the client and the server without interpreting the application protocol.
Detailed explanation-5: -Proxy firewalls filter traffic at the application layer, which is Layer 7 of the Open Systems Interconnection model.