TAILIEUCHUNG - Chapter 1: Starting simple

This chapter will introduce you to the main contents as follows: What Is IP routing, directly connected networks, static routing, dynamic routing, the routing table, underlying processes, summing up. | Page 1 Wednesday January 9 2002 12 23 PM In this chapter What Is IP Routing Directly Connected Networks Static Routing Dynamic Routing The Routing Table Underlying Processes Summing Up _________CHAPTER 1 Starting Simple What Is IP Routing A young woman boards a commuter train in a small town in Quebec changes trains a couple of times and a day later arrives in New York City. She walks up the stairs from the platform into Grand Central Terminal looks up above her head and for the first time sees the constellations hundreds of feet above on the ceiling. A high school student in New Zealand downloads maps of Sri Lanka from a local Sri Lankan web site. The maps show the natural features the political boundaries the flora and fauna rainfall ancient kingdoms languages and religions. The download takes thousands of IP packets that find their way from Sri Lanka to the student s PC in New Zealand. Just as our Canadian friend changed trains at several stations along the way the IP packets from the Sri Lankan web site may have bounced through dozens of routers before arriving at the student s machine. The routing of IP packets in an IP network is the set of tasks required to move an IP packet from router to router to its destination as specified in the IP header field. This book is about the set of tasks that accomplish IP routing. There are similarities in routing concepts between IP networks transportation systems and mail delivery operations. Throughout this text we will often illustrate IP routing concepts by comparison with these other systems. 1 Page 2 Wednesday January 9 2002 12 23 PM Directly Connected Networks When our Canadian visitor finally picks up her bags and is ready to head out of Grand Central Terminal she looks around for the exit signs. On one end below a row of immense windows is a sign saying Vanderbilt Avenue. Below the opposite row of tall windows is a sign saying Lexington Avenue. Under the large stone arches is a sign reading .

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