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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!
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Not only is TCP/IP the “underlying language of the Internet”, it is also used in most private networks today. Even former “competitors” to TCP/IP such as NetWare now use TCP/IP to carry traffic. The Internet continues to grow, and so do the capabilities and functions of TCP/IP.
The modern Internet is not based on OSI, but on the simpler TCP/IP model. However, the OSI 7-layer model is still widely used, as it helps visualize and communicate how networks operate, and helps isolate and troubleshoot networking problems.
TCP is one of the basic standards that define the rules of the internet and is included within the standards defined by the Internet Engineering Task Force (IETF). It is one of the most commonly used protocols within digital network communications and ensures end-to-end data delivery.
The Internet and almost all networks in use today have standardized on the TCP/IP model. It is often referred to as the language of the Internet, because applications are typically built around this protocol suite. Figure 1-8 shows the TCP/IP model and some of the more well-known protocols and corresponding layers.
TCP/IP is an "implementation" of the OSI model. The OSI model was developed by researchers. It only exists on paper. Afterwards TCP/IP was created by using the principles that were described in the OSI model. TCP/IP in it's various versions is what the internet is based on today. OSI was first, but again it was/is only a MODEL.
SO basically OSI &TCP/IP model provide a set of rules using which a uniform communication method can be established in a network. 8 clever moves when you have $1,000 in the bank.
The OSI model can be described as a more comprehensive reference networking framework. If TCP/IP has four layers, OSI has seven. These are the application, presentation, session, transport, network, data link, and physical layers.
However, the TCP/IP concept, which is based on standard protocols, was designed and developed by the Department of Defense (DoD) in the 1960s. TCP/IP is a simplified version of the OSI model. It has four layers, as opposed to the OSI model’s seven.
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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