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© 2009 Pearson Education Inc., Upper Saddle River, NJ. All rights reserved. 1 Computer Networks and Internets, 5e By Douglas E. Comer Lecture PowerPoints By Lami Kaya, LKaya@ieee.org © 2009 Pearson Education Inc., Upper Saddle River, NJ. All rights reserved. 2 Chapter 18 WAN Technologies And Dynamic Routing © 2009 Pearson Education Inc., Upper Saddle River, NJ.

All rights reserved. 3 Topics Covered. 18.1 Introduction. 18.2 Large Spans And Wide Area Networks.

18.3 Traditional WAN Architecture. 18.4 Forming A WAN. 18.5 Store And Forward Paradigm. 18.6 Addressing In A WAN. 18.7 Next - Hop Forwarding. 18.8 Source Independence.

18.9 Dynamic Routing Updates In A WAN. 18.10 Default Routes. 18.11 Forwarding Table Computation. 18.12 Distributed Route Computation. 18.13 Shortest Path Computation In A Graph. 18.14 Routing Problems © 2009 Pearson Education Inc., Upper Saddle River, NJ. All rights reserved.

4 18.1 Introduction. This chapter – considers the structure of a network that spans an arbitrarily large area – describes the basic components used to build a packet switching system – explains the fundamental concept of routing – presents the two basic routing algorithms – explains the advantages of each algorithm – extends the discussion of routing to the Internet – presents routing protocols that use the algorithms described here © 2009 Pearson Education Inc., Upper Saddle River, NJ. All rights reserved. 5 18.2 Large Spans And Wide Area Networks. Networking technologies can be classified according to the distance spanned: – PAN spans a region near an individual – LAN spans a building or campus – MAN spans a large metropolitan area – WAN spans multiple cities or countries.

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Consider a company that uses a satellite bridge to connect LANs at two sites – Should the network be classified as a WAN or as an extended LAN? © 2009 Pearson Education Inc., Upper Saddle River, NJ. All rights reserved.