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.”
Usage Examples
- 1
“The team applied osi model best practices to improve their networking outcomes significantly.”
- 2
“Understanding osi model is essential for anyone building a career in IT & Technology.”
When & How to Use
Use 'OSI Model' when working in Networking contexts where 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.
- ▸Applying osi model principles during a networking project or initiative
- ▸Explaining osi model to a junior team member or stakeholder unfamiliar with IT & Technology
- ▸Evaluating options or proposals using osi model as a decision-making criterion
Etymology & Origin
The term 'OSI Model' derives from professional usage and entered IT & Technology professional usage as the field formalised in the 20th century.
History & Evolution
The concept of osi model has evolved alongside IT & Technology. Early practitioners relied on informal methods; structured approaches emerged with the professionalisation of networking in the mid-20th century. Today, osi model is a standard part of IT & Technology practice globally.
Synonyms
- network reference model
- layered network model
- OSI stack
Images
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Related Terms
- tcp-ip
- network-protocol
- packet
- encapsulation