COMPUTER THREATS SECURITY
WHAT IS A FIREWALL IN NETWORK SECURITY
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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 4
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Layer 5
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Layer 7
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Detailed explanation-1: -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.
Detailed explanation-2: -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.
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: -“A circuit-level gateway is a firewall that provides User Datagram Protocol (UDP) and Transmission Control Protocol (TCP) connection security, and works between an Open Systems Interconnection (OSI) network model’s transport and application layers such as the session layer.
Detailed explanation-5: -1) application gateway opens 2 tcp connection inbound and outbound and so does circuit gateway. 2) application gateway just authenticates but circuit level gateway does not authenticate(then how does it trust the incoming and outgoing users), it is confusing.