1	OSI Model Introduction to the seven layers
2	The OSI Reference Model OSI – Open Systems Interconnect The Model was developed in the early 1970s by the International Standards Organizations (ISO). It provides a set of general design guidelines for data-communications systems and gives a standard way to describe how various portions (layers) communicate in a system
3	The Layering protocol The hierarchical layering of protocols on a computer that forms the OSI model is known as a stack. A given layer in a stack sends commands to layers below it and services commands from layers above it. The seven layers in order from highest to lowest are Application, Presentation, Session, Transport, Network, Data Link, and Physical can be remembered by using the following memory aide: All People Seem To Need Data Processing .
4	It’s the Highway of Networks Imagine Interstate highways, and all of the standards that they are built with, standard sizes, traffic flows, signs, etc. This reduces chaos and improves the ability of auto manufactures…OSI does the same for the Information highway, or networks.
5	The Seven Layers
6	Layer Details Application Layer – Allows applications to use the network. Presentation Layer – translates data to ensure that it is presented properly for the end user. Session Layer – works primarily at the beginning and ending of the transmission
7	Layer Details Transport Layer – organizes segments for delivery, and segments and reassembles packets as they are sent/received. Network Layer – main purpose is to decide the path the information should follow
8	Layer Details Data Link Layer – provides a system through which network devices can share a communication channel Physical Layer – the interface through which the data moves along the network
9	Conclusion When data is sent, it works down the layers, travels along the physical layer, and then travels up the layers… the information is contained by headers, which separate the layers.