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Jun 18, 2024 · Learn what is OSI model, a 7-layer framework for network communication, and how it works. Explore the functions and examples of each layer, from physical to application, and compare OSI model with TCP/IP model.
- 38 min
- Physical layer. The main functionality of the physical layer is to transmit the individual bits from one node to another node. It is the lowest layer of the OSI model.
- Data-Link Layer. This layer is responsible for the error-free transfer of data frames. It defines the format of the data on the network. It provides a reliable and efficient communication between two or more devices.
- Network Layer. It is a layer 3 that manages device addressing, tracks the location of devices on the network. It determines the best path to move data from source to the destination based on the network conditions, the priority of service, and other factors.
- Transport Layer. The Transport layer is a Layer 4 ensures that messages are transmitted in the order in which they are sent and there is no duplication of data.
- Layer 1 is the physical layer. There’s a lot of technology in Layer 1 - everything from physical network devices, cabling, to how the cables hook up to the devices.
- Layer 2 is the data link layer. Layer 2 defines how data is formatted for transmission, how much data can flow between nodes, for how long, and what to do when errors are detected in this flow.
- Layer 3 is the network layer. This is where we send information between and across networks through the use of routers. Instead of just node-to-node communication, we can now do network-to-network communication.
- Layer 4 is the transport layer. This where we dive into the nitty gritty specifics of the connection between two nodes and how information is transmitted between them.
The development of the OSI model started in the late 1970s to support the emergence of the diverse computer networking methods that were competing for application in the large national networking efforts in the world (see OSI protocols and Protocol Wars).
The Open Systems Interconnection (OSI) model—also called the OSI reference model—is a conceptual model that divides network communication and interoperability into seven abstract layers. It provides a standardized model that enables different applications, computer systems and networks to communicate.
Jun 27, 2024 · Learn about the OSI model, a logical and conceptual model that defines network communication used by systems open to interconnection and communication with other systems. The web page explains the characteristics, history, and functions of the seven layers of the OSI model and the protocols supported at each layer.
The OSI model breaks down computer network communication into seven layers. All of the layers work together to create a digital message. Understanding the OSI model will help you communicate with other network technologists.
