Networks enable connected hosts—computers—to share resources and access resources.
We use models to Simplify the overall processes of Networking. All models are simplified representations of the real thing.
Early networks were made by single manufacturers, but couldn't easily connect with other networks which made by another manufacturers. To fix this, the ISO created the OSI model, a standard that helps different networks work together. Making it easier to understand, design, and troubleshoot networks.
Network Interface Card serves as the interface between the PC and the network.
The OSI seven-layer model organizes computer networking into 7 layers. Protocols at each layer set rules that help devices and software work properly. Each layer works independently and trusts the other layers.
This layer defines the method of moving data between computers. Anything that transfers data from one system to another, such as copper cabling, central boxes, fiber optics, or even radio waves, is part of the OSI Physical layer. Network Interface Cards (NICs) are also components of the OSI Physical layer.