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CNI5e Ch 01.ppt

* * * * * * * * * ? 2009 Pearson Education Inc., Upper Saddle River, NJ. All rights reserved. * 1.10 The Inside Scoop Eventually, it became clear that TCP/IP technology was technically superior to OSI and efforts to develop and deploy OSI protocols were terminated Standards bodies were left with the seven-layer model Advocates for the seven-layer model have tried to stretch the definitions to match TCP/IP They argue that layer three could be considered an Internet layer and that a few support protocols might be placed into layers five and six Perhaps the most humorous part of the story is that many engineers still refer to applications as layer 7 protocols even when they know that layers five and six are unfilled and unnecessary ? 2009 Pearson Education Inc., Upper Saddle River, NJ. All rights reserved. * 1.11 Remainder of the Text The book text is divided into five major parts PART I Introduction And Internet Applications Introduces network applications and network programming PART II Data Communication Basics describes data communications and the transmission of information explains how electrical and electromagnetic energy can be used to carry information across wires or through the air shows how data is transmitted ? 2009 Pearson Education Inc., Upper Saddle River, NJ. All rights reserved. * 1.11 Remainder of the Text PART III Packet Switching and Network Technologies focuses on packet switching and packet technologies explains why computer networks use packets describes the general format of packets examines how packets are encoded for transmission shows how each packet is forwarded across a network to its destination introduces basic categories of computer networks, such as Local Area Networks (LANs) Wide Area Networks (WANs) characterizes the properties of each category discusses some example technologies ? 2009 Pearson Education Inc., Upper Saddle River, NJ. All rights reserved. * 1.11 Remainder of the Text PART IV Internetworking covers internetworking

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