TCP/IP and OSI
TCP/IP and OSI are the two networking models that builds nowadays networks. A networking model is an organized of set of documents that describes functions required in a network.
We live completely relax about computers and mobile devices having communications among themselves. However, once upon a time, when there were no networking and every vendor made their devices to communicate only with others of their brand, this communication was hard to occur. So, it was necessary to create an open standardized networking model that all vendors would support. It gave origin to the design and development of the Open System Interconnection (O.S.I. model). A few years later, the U.S. Defense Department opened a contract to develop a new network model. Then, it was the origin of what was called the TCP/IP networking model.
TCP/IP architectural model and example protocols.
| TCP/IP Architecture Layer | Example Protocols |
|---|---|
| Application | HTTP, POP3, SMTP |
| Transport | TCP, UDP |
| Internet | IP |
| Network Access | Ethernet, Frame Relay |
The TCP/IP Application Layer.
This netwokr layer provides an interface between software running on a computer and the network itself.
The TCP/IP Transport Layer.
The TCP/IP transport layer consists of 2 main protocols: the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).
This post will be continued with more information about the TCP/IP layers, protocols involved as well as the OSI network model.
