The OSI Model (Open Systems Interconnection Model) is a conceptual framework that standardizes network communication into 7 layers. Each layer has specific responsibilities and communicates with the layers above and below it. The OSI model helps network engineers understand and troubleshoot complex network issues.
The OSI model divides network communication into 7 layers, each with specific responsibilities. Layer 1 (Physical) handles raw bit transmission; Layer 2 (Data Link) manages local network communication using MAC addresses; Layer 3 (Network) routes packets using IP addresses; Layer 4 (Transport) provides end-to-end communication with TCP or UDP; Layers 5-7 handle sessions, data formatting and application protocols. Understanding the OSI model is fundamental to network troubleshooting and design.