Microsoft MTA Networking

The (Open Systems Interconnection) OSI has been developed by International Organization for Standardization (ISO). The OSI model provides a framework for creating and implementing networking standards and devices and describes how network applications on different computers can communicate through the network media. In this post, each of the seven layers of the OSI model will be explained in simple terms.
Layer 1 – Physical layer

Physical layer defines the physical medium itself. It details how cables, connectors and network interface cards are supposed to work and how to send and receive bits. When a networking problem occurs, many networking pros go right to the physical layer to check that all of the cables are properly connected and that the power plug hasn’t been pulled from the router, switch or computer, for example.
Layer 2 – Data Link

Data Link layer defines the format of data on the network. The data link layer is divided into two sub layers: The Media Access Control (MAC) layer and the Logical Link Control (LLC) layer. MAC layer is used for hardware addressing and for controlling the access method. The LLC layer is used for used for flow control and error detection.

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