INFORMATION AND COMMUNICATION TECHNOLOGY 10

  What is OSI model (Open Systems Interconnection)? OSI (Open Systems Interconnection) is a reference model for how applications communicate over a network. This model focuses on providing a visual design of how each communications layer is built on top of the other, starting with the physical cabling, all the way to the application that's trying to communicate with other devices on a network. A reference model is a conceptual framework for understanding relationships. The purpose of the OSI reference model is to guide technology vendors and developers so the digital communications products and software programs they create can interoperate and to promote a clear framework that describes the functions of a networking or telecommunications system that's in use. Most vendors involved in telecommunications try to describe their products and services in relation to the OSI model. This helps them differentiate among the various transport protocols, addressing schemes and communicati...

  Overview Network devices  are  physical  devices that enable communication and interaction between  hardware  on a  computer  network. Each networking device operates in a distinct computer network segment and performs distinct functions. A network may require hundreds or thousands of different network devices to maintain and build out various  LAN  and  WAN . Network devices like the  hub ,  bridge ,  repeater ,  modem ,  router ,  gateway , etc., are the basic building blocks of an extensive network. What are Networking Devices? Network devices  are  physical  devices that enable communication and interaction between  hardware  on a  computer  network. Network devices are building blocks that permit communication between  services  and the  endpoints  that consume those services. In other words, they're connectors that allow devices on a network...