Are we using TCP/IP or OSI in internet?

tcp ip osi
Abdelouahab picture Abdelouahab · Feb 17, 2012 · Viewed 37.8k times · Source

sorry for that question, but i've searched about that topic, and it's not really clear, they say that internet uses tcp/ip but sometimes they say that osi also is used! for example, UDP application, they dont use tcp/ip since it's not a tcp?!

please, can someone make it clear? mean; where is "exactly" OSI is used, and where is "exactly" TCP/IP is used!

Answer

ntziolis picture ntziolis · Feb 17, 2012

The internet is based on TCP/IP which is a "simplified" implementation of the theoretical OSI model. Maybe it's even better to say TCP/IP was inspired by the OSI model, since it does not really match up on closer review.

More info here:

http://en.wikipedia.org/wiki/OSI_model#Comparison_with_TCP.2FIP_model

and here:

http://en.wikipedia.org/wiki/TCP/IP_model#OSI_and_TCP.2FIP_layering_differences

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