1.5 TCP/IP
Coming back to TCP/IP, this deserves special mention since it is at the foundation of any computer network. It evolved from ARPANET which is a WAN protocol. Compared to the OSI model of seven layers, TCP/IP has four layers, though not as rigid a layering. Nevertheless, the layering is shown in Figure 1.2.
Fig. 1.2 TCP/IP against the OSI layers
The success of TCP/IP as the major protocol for the Internet is largely because of IP which enables hosts to connect together geographically dispersed networks of computers irrespective of their size or types of links. The way in which this is done is through the concept of a host and ...
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