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Part 1: Introduction Introduction Services and protocols The reference models The five layers reference model The TCP/IP reference model The OSI reference model Organisation of the book | Computer Networking Principles Protocols and Practice Release 0.25 Olivier Bonaventure October 30 2011 Saylor URL http www.saylor.org courses cs402 The Saylor Foundation BY Computer Networking Principles Protocols and Practice was written by Dr. Olivier Bonaventure of the Université catholique de Louvain for teaching Local Area Networks. After The Saylor Foundation accepted his submission to Wave I of the Open Textbook Challenge this textbook was relicensed as CC-BY 3.0. Information on The Saylor Foundation s Open Textbook Challenge can be found at www.saylor.org otc . Computer Networking Principles Protocols and Practices October 31 2011 by Olivier Bonaventure is licensed under a Creative Commons Attribution CC BY license made possible by funding from The Saylor Foundation s Open Textbook Challenge in order to be incorporated into Saylor.org s collection of open courses available at http www.saylor.org. Full license terms may be viewed at http creativecommons.org licenses by 3.0 legalcode Saylor URL http www.saylor.org courses cs402 The Saylor Foundation Contents 1 Preface 3 2 Introduction 5 2.1 Services and protocols. 11 2.2 The reference models . 20 2.3 Organisation of the book. 25 3 The application Layer 27 3.1 Principles. 27 3.2 Application-level protocols . 32 3.3 Writing simple networked applications . 55 3.4 Summary. 61 3.5 Exercises. 61 4 The transport layer 67 4.1 Principles of a reliable transport protocol . 67 4.2 The User Datagram Protocol. 87 4.3 The Transmission Control Protocol. 89 4.4 Summary . 113 4.5 Exercises . 114 5 The network layer 127 5.1 Principles.127 5.2 Internet Protocol.140 5.3 Routing in IP networks.170 5.4 Summary.195 5.5 Exercises.195 6 The datalink layer and the Local Area Networks 211 6.1 Principles . 211 6.2 Medium Access Control.214 6.3 Datalink layer technologies . 228 6.4 Summary . 246 6.5 Exercises . 246 7 Glossary 249 8 Bibliography 255 Saylor URL http www.saylor.org courses cs402 Rff i The Saylor Foundation .