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.
Continue reading “OSI (Open Systems Interconnection) Layer – Functionality, Tools and Protocols”
What is a network packet?
It turns out that everything you do on the Internet involves packets. For example, every Web page that you receive comes as a series of packets, and every e-mail you send leaves as a series of packets. Networks that ship data around in small packets are called packet switched networks. Continue reading “What is a Packet”
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”