Chapter 4
Layer 3: The Network Layer
Introduction
The network layer is key to the operation of the stack. Some of the protocols and services that reside here include Internet Protocol (IP), Internet Control Message Protocol (ICMP), and routing protocols. IP provides the ability for global communication, as well as a unique address scheme that is not found in Ethernet. It does an amazing job for a connectionless protocol, and has the ability to handle fragmentation, Quality of Service, and IP header error checking. However, ...
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