OSI (Open Systems Interconnection) Layer – Functionality, Tools and Protocols

OSI Layer Model developed by ISO, which is a 7 layer networking model, defines how networks should be designed and how devices on a network talk to each other. Each layer in the OSI model works directly with the layer above or below it and has a set function for moving communication across a network. The following table gives a quick overview of each layer and devices / tools / protocols used by each layer for communication.

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Understanding Demilitarized Zone in Networks

Demilitarized zone or DMZ as it is abbreviated is a firewall configuration for securing internal network of an organization.In any business environment a need arises to permit external access to some part of organization’s network, for example to enable external e-mail to be received and to provide public access to a web site. This introduces the concept of the “demilitarized zone”. Continue reading “Understanding Demilitarized Zone in Networks”