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A  frame of reference used to develop the internets protocols

Consists of layers that perform functions necessary to prepare data for transmission over a network

The OSI model

Used to divide network communications into seven layers. It is used by most networks. A protocol stack is a system that uses a series of layers.

Application

Responsible for network services to applications

Presentation

Transforms data formats to provide a standard interface for the app layer

Session

Manages and terminates connections

Transport

Provides transport and flow control across the network

Network

Logical addressing and domain of routing

Datalink

Physical addressing  and media access procedures

Physical

Define electrical and physical specs for devices

*OSI breaks up the app into three layers and the network interface into two layers*

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