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2. Comparison of firewalls - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_firewalls

   security gateways Proprietary operating system Junos: SonicWall: Proprietary: Included on Dell appliance Proprietary operating system SonicOS. Based on the Linux kernel Barracuda Firewall Proprietary: Included Firewall Next Generation appliance Windows-based appliance embedded firewall distribution Cyberoam: Proprietary: Included Firewall ...

3. Firewall (computing) - Wikipedia

   en.wikipedia.org/wiki/Firewall_(computing)

   In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on configurable security rules. [ 1 ] [ 2 ] A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet , [ 3 ] or between several VLAN s.

4. OSI model - Wikipedia

   en.wikipedia.org/wiki/OSI_model

   The Open Systems Interconnection (OSI) model is a reference model from the International Organization for Standardization (ISO) that "provides a common basis for the coordination of standards development for the purpose of systems interconnection."

5. Proxy server - Wikipedia

   en.wikipedia.org/wiki/Proxy_server

   Transparent firewall means that the proxy uses the layer-7 proxy advantages without the knowledge of the client. The client presumes that the gateway is a NAT in layer 3, and it does not have any idea about the inside of the packet, but through this method, the layer-3 packets are sent to the layer-7 proxy for investigation.

6. Application firewall - Wikipedia

   en.wikipedia.org/wiki/Application_firewall

   This was the first transparent firewall, known as the inception of the third generation firewall, beyond a traditional application proxy (the second generation firewall), released as the commercial product known as Gauntlet firewall. Gauntlet firewall was rated one of the top application firewalls from 1995 until 1998, the year it was acquired ...

7. Network layer - Wikipedia

   en.wikipedia.org/wiki/Network_layer

   The network layer provides the means of transferring variable-length network packets from a source to a destination host via one or more networks. Within the service layering semantics of the OSI (Open Systems Interconnection) network architecture, the network layer responds to service requests from the transport layer and issues service requests to the data link layer.