OSI Referenzmodell

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Layer		Funktion
7. Application		The application layer provides the means for end-to-end connectivity between individuals in the human network using data networks.
6. Presentation		The presentation layer provides for common representation of the data transferred between application layer services.
5. Session		The session layer provides services to the presentation layer to organize its dialogue and to manage data exchange.
4. Transport		The transport layer defines services to segment, transfer, and reassemble the data for individual communications between the end devices.
3. Network		The network layer provides services to exchange the individual pieces of data over the network between identified end devices.
2. Data Link		The data link layer protocol describes methods for exchanging data frames between devices over a common medium.
1. Physical		The physical layer protocol describes the mechanical, electrical, functional, and procedural means to activate, maintain, and de-activate physical connections for bit transmission to and from a network device.