OSI Model
A seven-layer conceptual framework that standardizes how different network protocols communicate.
Also: Open Systems Interconnection Model
Definition
The Open Systems Interconnection (OSI) model is a conceptual framework that divides network communication into seven distinct layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. Each layer has specific responsibilities and communicates with the layers directly above and below it. The OSI model provides a universal language for describing network functions, helping engineers troubleshoot issues and design interoperable systems.
Example
“A network engineer troubleshooting a connectivity issue checks the Physical layer first (cables) before moving up to Network (IP routing) and Application (HTTP) layers.”
Synonyms
- network reference model
- layered network model
- OSI stack
Images
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Related Terms
- tcp-ip
- network-protocol
- packet
- encapsulation