7-Layer OSI model

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OSI 7-Layer Model

The 7-Layer OSI Model (OSI Reference Model, or OSI model for short)[1] is a reference model for networked communications, standardized by the ISO.


The 7-layer OSI Network Communication Model is the original electronic communication architecture which formed the basis for the TCP/IP standard, which has become the de facto standard for Internet communication and the World Wide Web.


Layers

(in actual OSI stack location order, numerical order descending)
7. Application Layer
6. Presentation Layer
5. Session Layer
4. Transport Layer
3. Network Layer
2. Data-link Layer
1. Physical Layer

(in numerical order, not stacked order)

  1. Physical Layer
  2. Data-link Layer
  3. Network Layer
  4. Transport Layer
  5. Session Layer
  6. Presentation Layer
  7. Application Layer



Criticism

The model itself serves only as a general guide for networked communications and provides little in the way of implementable standards, protocols or packaged software which can be readily deployed.

For this reason the 4-layer TCP/IP protocol has by far surpassed the OSI model in terms of implementation and widespread use, to the point of being a de facto networking standard.


External Links


References

  1. wikipedia:OSI model


See Also

ISO | Internet | TCP/IP