Original textbook © 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's collection of open courses available at: http://www.saylor.org. Free Pdf 282 pages at https://www.textbookequity.org/bonaventurecomputernetworkingprinciplesprotocolsandpractice/ This open textbook aims to fill the gap between the opensource implementations and the opensource network specifications by providing a detailed but pedagogical description of the key principles that guide the operation of the Internet. 1 Preface 2 Introduction 3 The application Layer 4 The transport layer 5 The network layer 6 The datalink layer and the Local Area Networks 7 Glossary 8 Bibliography