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CCNA_Companion Guide Chapter3

CCNA_Companion Guide Chapter3 - 03_1587132060_ch03.qxd 5:30...

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CHAPTER 3 Introduction to Dynamic Routing Protocols Objectives Upon completion of this chapter, you should be able to answer the following questions: Can you describe the role of dynamic routing protocols and place these protocols in the con- text of modern network design? What are several ways to classify routing protocols? How are metrics used by routing protocols, and what are the metric types used by dynamic rout- ing protocols? How do you determine the administrative dis- tance of a route, and what is its importance in the routing process? What are the different elements in the routing table? Given realistic constraints, can you devise and apply subnetting schemes? Key Terms This chapter uses the following key terms. You can find the definitions in the Glossary at the end of the book. scale page 149 algorithm page 151 autonomous system page 154 routing domain page 154 interior gateway protocols page 154 exterior gateway protocols page 154 path vector protocol page 156 distance vector page 156 vectors page 156 link-state page 157 link-state router page 157 converged page 157 classful routing protocols page 158 VLSM page 158 discontiguous page 158 classless routing protocols page 159 convergence page 159 administrative distance page 165
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The data networks that we use in our everyday lives to learn, play, and work range from small, local networks to large, global internetworks. At home, you might have a router and two or more computers. At work, your organization might have multiple routers and switch- es servicing the data communication needs of hundreds or even thousands of PCs. In Chapters 1 and 2, you discovered how routers are used in packet forwarding and that routers learn about remote networks using both static routes and dynamic routing protocols. You also know how routes to remote networks can be configured manually using static routes. This chapter introduces dynamic routing protocols, including how different routing proto- cols are classified, what metrics they use to determine best path, and the benefits of using a dynamic routing protocol. Dynamic routing protocols are typically used in larger networks to ease the administrative and operational overhead of using only static routes. Typically, a network uses a combina- tion of both a dynamic routing protocol and static routes. In most networks, a single dynamic routing protocol is used; however, there are cases where different parts of the net- work can use different routing protocols. Since the early 1980s, several different dynamic routing protocols have emerged. This chap- ter begins to discuss some of the characteristics and differences in these routing protocols; however, this will become more evident in later chapters, with a discussion of several of these routing protocols in detail.
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