3.3. The Internet Layer Protocols
The Internet layer of the DoD model is made up of various protocols, with the three main protocols being the Internet Protocol (IP), the Internet Control Message Protocol (ICMP), and the Address Resolution Protocol (ARP). The following sections introduce these three protocols and provide more detail. And no discussion of things layer 3 would be complete without mentioning routers and the process of routing.
3.3.1. The Internet Protocol
The Network layer portion of the DoD model is called the Internet layer. Not surprisingly, the main protocol at this layer is the Internet Protocol (IP). IP is what actually moves the data from point A to point B, a process that is called routing.
IP is considered connectionless ...
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