One of the best break downs of the OSI model that I have seen today.
osi model - Google Search
Did you Know
OSI Model 7 layers
ISO Model and Protocols that go with them.
Understanding this model is essential for anyone who wants to be involved in the field of computer networking. If you have forgotten the OSI model or just want to get a crash course in it, this cheat sheet by Ccna-security.net should help
tutorials & resources
Network OSI model Mehr
Networking and IT
The OSI Model – What It Is; Why It Matters; Why It Doesn't Matter.
CompTIA Network+ Training / Tip -OSI Layer Model .For more information to become CompTIA Network+ or Cisco CCNA Please visit: http://www.asmed.com/cisco-ccna/
CompTIA Network+ Training
OSI model Definition from PC Magazine Encyclopedia
TCP/IP Definition from PC Magazine Encyclopedia » pcmag.com