Computer Basics : OSI Model

The OSI Model
The Open Systems Interconnection model (OSI Model) is a conceptual model that characterizes and standardizes thecommunication functions of a telecommunication or computing system without regard of their underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard protocols. The model partitions a communication system into abstraction layers. The original version of the model defined seven layers.



Layer 7 — Application Layer — The layer users interact with
Layer 6 — Presentation Layer — Generally the layer the Operating System is on
Layer 5 — Session Layer — The layer that controls the communication session between two computers
Layer 4 — Transport Layer — The layer that controls Windowing and other tasks related to communication to send the packets.
Layer 3 — Network Layer — The layer that Routers and IP addresses operate at
Layer 2 — Data Link Layer — The layer that Switches, MAC Addresses and ARP reside at
Layer 1 — Physical Layer — The layer that cabling resides on

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