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May 6, 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
- 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.
- 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.
OSI had two major components: an abstract model of networking, called the Basic Reference Model or seven-layer model, and a set of specific protocols. The OSI reference model was a major advance in the standardisation of network concepts.
The OSI reference model describes the functions of a telecommunication or networking system, while TCP/IP is a suite of communication protocols used to interconnect network devices on the internet. TCP/IP and OSI are the most broadly used networking models for communication.
Jan 19, 2021 · The Open Systems Interconnection (OSI) model is a conceptual framework that describes the functions of a networking or telecommunication system in seven layers. The OSI model describes how a network functions and standardizes the way that systems send information to one another.
Aug 6, 2021 · The OSI Model is a seven-layer framework that describes how devices communicate over a network. Learn the functions, protocols and headers of each layer, and why the OSI Model is essential for IT pros.
