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2. 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.

3. OSI model - Wikipedia

   en.wikipedia.org/wiki/OSI_model

   The link layer corresponds to the OSI data link layer and may include similar functions as the physical layer, as well as some protocols of the OSI's network layer. These comparisons are based on the original seven-layer protocol model as defined in ISO 7498, rather than refinements in the internal organization of the network layer.

4. List of network protocols (OSI model) - Wikipedia

   en.wikipedia.org/wiki/List_of_network_protocols...

   This article lists protocols, categorized by the nearest layer in the Open Systems Interconnection model.This list is not exclusive to only the OSI protocol family.Many of these protocols are originally based on the Internet Protocol Suite (TCP/IP) and other models and they often do not fit neatly into OSI layers.

5. 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 VLANs.

6. 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 ...

7. Network access control - Wikipedia

   en.wikipedia.org/wiki/Network_Access_Control

   Network access control (NAC) is an approach to computer security that attempts to unify endpoint security technology (such as antivirus, host intrusion prevention, and vulnerability assessment), user or system authentication and network security enforcement.