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OSI (Open System Interconnection) 7 Layer Model

Physical Layer (1) - Cable and Hub.

Data Link Layer (2) - MAC and LLC - Frame - Switch, Bridge and WAP

Network (3) - Packets - Router, IP/IPX/ICMP

Transport (4) - Host to Host and Flow Control - TCP/SPX/UDP

Session (5) - Synch and send - Logical Ports - RPC/SQL/NFS NetBIOS names.

Presentation (6) - encrypt and decrypt - JPEG/ASCII/EBDIC/TIFF

Application (7) - End user layer - SMTP, FTP.

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