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Implementing Cisco Networking Solutions by Harpreet Singh

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The TCP/IP model

The Advanced Research Projects Agency Network (ARPANET), which was initially funded by the US Department of Defense (DoD) was an early packet-switching network and the first network to implement the protocol suite TCP/IP. ARPANET was the test bed of the TCP/IP protocol suite which resulted in the TCP/IP model also known as the DoD model.

The TCP/IP model is a simplified model of the OSI model and has only four broad layers instead of the seven layers of the OSI model. Figure 2 shows the comparison between the two models. As can be seen from the following figure, the TCP/IP model is a much more simplified model, where the top three layers of the OSI model have been combined into a single application layer, and the physical ...

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