Open Systems Interconnection Model

OSI Model
7 Application HTTP, Telnet, FTP, SMTP
6 Presentation
5 Session TCP
4 Transport
3 Network IP / IPv6
2 Data Link PPP
1 Physical

The International Organization for Standardization created a seven layer reference model known as the OSI model. This model is a layered approach to describing a standard way to show how data flows on a computer network. Before the OSI model, a team of scientists from DARPA were using a model based on a specific protocol suite called TCP/IP. The TCP/IP model is still widely used today mainly because TCP/ip has become the accepted universal standard of for the Internet.

Author: D.Shaun Morgan