Network Protocols and Standards
Open Systems Interconnect Reference Model

You can take a quick review of the Seven Layers and what they do if you'd like. This page contains links relevant to each layer.

bulletJohn Larmouth, Understanding OSI - covers the entire model.
bulletLayer 1 - The Physical Layer
bulletLayer 2 - The Data Link Layer
bulletLayer 3 - The Network Layer
bulletLayer 4 - The Transport Layer
bulletShim Layer - BSD Sockets and WinSock
bulletLayer 5 - The Session Layer
bulletLayer 6 - The Presentation Layer
bulletLayer 7 - The Application Layer