OSI
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
The Open Systems Interconnection reference model divides network communication into seven layers: - Physical layer: electrical signal transmission - Data link layer: frame transmission and error detection - Network layer: routing and addressing - Transport layer: end-to-end connection - Session layer: session management - Presentation layer: data format conversion - Application layer: user interface.
SCAFFOLDING EFFECT
Reduce cognitive load
Layered decoupling, troubleshooting layer by layer. It decomposes complex network communication into independent layers, facilitating division of labor and fault localization.
Anchor fast decisions
It splits network communication into seven layers, each layer only interacts with adjacent layers, provides services upward, and calls capabilities downward. Each layer evolves independently (changing the implementation of one layer does not affect others), and faults can be isolated and located layer by layer, achieving 'layered decoupling of complex systems'.
MINIMUM ACTION
In progress 0/4Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/OSIverified
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