Features of the Book
Several features of this text are designed to make it particularly easy for students to
understand data communications and networking. Structure
We have used the five-layer Internet model as the framework for the text not only because
a thorough understanding of the model is essential to understanding most current networking
theory but also because it is based on a structure of interdependencies: Each layer
builds upon the layer beneath it and supports the layer above it. In the same way, each concept
introduced in our text builds upon the concepts examined in the previous sections. The
Internet model was chosen because it is a protocol that is fully implemented.
This text is designed for students with little or no background in telecommunications
or data communications. For this reason, we use a bottom-up approach. With this
approach, students learn first about data communications (lower layers) before learning
about networking (upper layers). Visual Approach
The book presents highly technical subject matter without complex formulas by using a
balance of text and figures. More than 700 figures accompanying the text provide a
visual and intuitive opportunity for understanding the material. Figures are particularly
important in explaining networking concepts, which are based on connections and
transmission. Both of these ideas are easy to grasp visually. Highlighted Points
We emphasize important concepts in highlighted boxes for quick reference and immediate
attention. Examples and Applications
When appropriate, we have selected examples to reflect true-to-life situations. For example,
in Chapter 6 we have shown several cases of telecommunications in current telephone
networks. Recommended Reading
Each chapter includes a list of books and sites that can be used for further reading. Key Terms
Each chapter includes a list of key terms for the student. Summary
Each chapter ends with a summary of the material covered in that chapter. The summary
provides a brief overview of all the important points in the chapter. Practice Set
Each chapter includes a practice set designed to reinforce and apply salient concepts. It
consists of three parts: review questions, exercises, and research activities (only for
appropriate chapters). Review questions are intended to test the student's first-level understanding
of the material presented in the chapter. Exercises require deeper understanding
of the material. Research activities are designed to create motivation for further study. Appendixes
The appendixes are intended to provide quick reference material or a review of materials
needed to understand the concepts discussed in the book. Glossary and Acronyms
The book contains an extensive glossary and a list of acronyms.
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