Chapter Two. Review of IP Addressing
This chapter provides a short summary of IP addressing in order to refresh readers’ existing knowledge and to clarify several commonly misunderstood aspects. Information is provided on classful and classless IP addressing, subnets and variable-length subnet masks, and other topics.
Working on the network layer of the OSI reference model, the Internet Protocol (IP) provides higher layers with logical addressing, routing, and best-path determination. Logical addressing is an important characteristic that allows network devices to disengage themselves from the details of physical topology and media access protocols. When two IP hosts communicate with each other, neither one knows or cares about the ...