Computer Networks Course - Class 05

Continuing with the course on networks, let's go to the next topic. 

What is the TCP/IP model? 

 

The TCP/IP architecture was developed in the 80's, facing a need of the United States Department of Defense. It sought to implement the OSI model in a practical and universal way and, for that, a stack of protocols was defined to be used in order to guarantee the interoperability of networks. 

It emerged as an academic network in a controlled environment. It is the successor of the ARPANet network, developed by the ARPA Studies Agency. 

Differently from the OSI model, but very similar, the TCP/IP protocol architecture has only 4 layers, as per RFC 793, and no longer 7 layers as defined by the OSI model. 

Here you can recognize the concepts of the OSI model just taking into account that the TCP/IP model has only 4 layers, as shown in the image below.

 

 

So for a simplification in the explanation just consider that the application, presentation, session layers of the OSI model are all contained in the application layer of the TCP/IP model and the link and physical layers are contained in the network access layer of the TCP model /IP. The same reasoning can be considered for the protocols of the layers of the OSI model are contained in the respective layers of the TCP/IP model. The TCP/IP model is what is actually used in practice, the OSI model being a theoretical and didactic model. 

 

That's it for today, see you soon  =)

 

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