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Mastering Intranet and Internet Technology
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The OSI Reference Model

7 Layer Protocol Stack


Packaging Data


Layer Description

Layer Functions
7 - Application Interface to the Host O/S, User Accounting and Security, O/S Services
6 - Presentation Compression/Decompression, Encryption/Decryption, ASCII/EBCDIC Translations, Data Reformating
5 - Session Multiplexing, Initiation, Management and Termination of Sessions
4 - Transport Data Handling, End-to-End Reliability
3 - Network Packets: Addressing, Subnet Accounting
2 - Data Link Frames: Node-to-Node Reliability
1 - Physical Bits: Connector, Voltages, Pins

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NBS Internet Marketing Last Update: 24/11/98 Web Author: Geoff May
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