Top-Down Network Design, 3/e (Hardcover)

Objectives

The purpose of Top-Down Network Design, Third Edition, is to help you design networks that meet a customer’s business and technical goals. Whether your customer is another department within your own company or an external client, this book provides you with tested processes and tools to help you understand traffic flow, protocol behavior, and internetworking technologies. After completing this book, you will be equipped to design enterprise networks that meet a customer’s requirements for functionality, capacity, performance, availability, scalability, affordability, security, and manageability.

Audience

This book is for you if you are an internetworking professional responsible for designing and maintaining medium- to large-sized enterprise networks. If you are a network engineer, architect, or technician who has a working knowledge of network protocols and technologies, this book will provide you with practical advice on applying your knowledge to internetwork design.

This book also includes useful information for consultants, systems engineers, and sales engineers who design corporate networks for clients. In the fast-paced presales environment of many systems engineers, it often is difficult to slow down and insist on a top-down, structured systems analysis approach. Wherever possible, this book includes shortcuts and assumptions that can be made to speed up the network design process.

Finally, this book is useful for undergraduate and graduate students in computer science and information technology disciplines. Students who have taken one or two courses in networking theory will find Top-Down Network Design, Third Edition, an approachable introduction to the engineering and business issues related to developing real-world networks that solve typical business problems.

Changes for the Third Edition

Networks have changed in many ways since the second edition was published. Many legacy technologies have disappeared and are no longer covered in the book. In addition, modern networks have become multifaceted, providing support for numerous bandwidth-hungry applications and a variety of devices, ranging from smart phones to tablet PCs to high-end servers. Modern users expect the network to be available all the time, from any device, and to let them securely collaborate with coworkers, friends, and family. Networks today support voice, video, high-definition TV, desktop sharing, virtual meetings, online training, virtual reality, and applications that we can’t even imagine that brilliant college students are busily creating in their dorm rooms.

As applications rapidly change and put more demand on networks, the need to teach a systematic approach to network design is even more important than ever. With that need in mind, the third edition has been retooled to make it an ideal textbook for college students. The third edition features review questions and design scenarios at the end of each chapter to help students learn top-down network design.

To address new demands on modern networks, the third edition of Top-Down Network Design also has updated material on the following topics:

¿ Network redundancy

¿ Modularity in network designs

¿ The Cisco SAFE security reference architecture

¿ The Rapid Spanning Tree Protocol (RSTP)

¿ Internet Protocol version 6 (IPv6)

¿ Ethernet scalability options, including 10-Gbps Ethernet and Metro Ethernet

¿ Network design and management tools

《自上而下的網路設計，第三版》的目標是幫助您設計符合客戶業務和技術目標的網路。無論您的客戶是您公司內的另一個部門還是外部客戶，本書都提供了經過驗證的流程和工具，幫助您了解流量流動、協議行為和互聯網技術。完成本書後，您將能夠設計符合客戶對功能、容量、性能、可用性、可擴展性、價格、安全性和可管理性的要求的企業網路。

本書適合負責設計和維護中大型企業網路的網路工程師、架構師或技術人員。如果您是具備網路協議和技術的實際知識的網路工程師、架構師或技術人員，本書將為您提供將知識應用於互聯網設計的實用建議。

本書還包含為顧問、系統工程師和銷售工程師設計企業網路的有用信息。在許多系統工程師快節奏的售前環境中，往往很難放慢腳步，堅持採用自上而下、結構化的系統分析方法。在可能的情況下，本書包含了可以加快網路設計過程的捷徑和假設。

最後，本書對計算機科學和信息技術專業的本科和研究生學生也很有用。已修讀了一兩門網路理論課程的學生將會發現《自上而下的網路設計，第三版》是一本易於理解的介紹，涉及開發解決典型業務問題的現實網路的工程和業務問題。

自第二版出版以來，網路在許多方面發生了變化。許多過時的技術已經消失，不再在本書中涵蓋。此外，現代網路變得多方面化，支持眾多寬頻應用和各種設備，從智能手機到平板電腦到高端服務器。現代用戶期望網路始終可用，從任何設備上安全地與同事、朋友和家人合作。現今的網路支持語音、視頻、高清電視、桌面共享、虛擬會議、在線培訓、虛擬現實以及我們甚至無法想像的由聰明的大學生在宿舍裡忙於創造的應用。

隨著應用程序的快速變化並對網路提出更多需求，教授系統化的網路設計方法比以往任何時候都更加重要。考慮到這一需求，第三版已經重新調整，使其成為大學生的理想教材。第三版在每章結尾提供了複習問題和設計場景，以幫助學生學習自上而下的網路設計。

為了應對現代網路的新需求，《自上而下的網路設計，第三版》還更新了以下主題的內容：

- 網路冗餘
- 網路設計中的模塊化
- Cisco SAFE安全參考架構
- 快速生成樹協議（RSTP）
- 網際網路協議版本6（IPv6）
- 以太網擴展性選項