Internet Protocol (IP) addresses are used to differentiate the computers on a LAN. They also include information that allows routers to route packets from a computer in one LAN to a computer in a different LAN. As you learned in Chapter 3, “TCP/IP,” these activities occur on the Internet layer of the TCP/IP model.
For a Cisco network technician, an understanding of IP addressing and its configuration is essential. In this chapter, the basics of IP addressing, both for IPv4 and IPv6, are covered, laying the groundwork for more advanced IP topics in Chapter 8, “Classless IP Addressing.” Specifically, this chapter covers the following topics: