本书讲述了CCIE路由选择与交换技术（R&S）书面考试将会涉及的全部内容，此外，还介绍了CCIE通信与业务（C&S）书面考试中与网络相关的内容。全书内容包括网络概念、设备操作、桥接与局域网（LAN）交换技术、广域网(WAN)、IP及IP路由选择协议、网络**性，以及多服务网络等等。
本书在介绍基本内容的同时，还提供了多种评估工具，以检查自己对某些内容的掌握情况。这样的评估工具包括小测试、问题与答案、实践模拟练习以及CD-ROM中提供的200多道练习题。
本书适合准备参加CCIE认证考试的读者，也可供相关网络技术人员参考。

Chapter 1 CCIE Certification, Test Preparation, and Using This Book
Cisco Certifications
Cisco Certification Areas
CCIE Certifications
CCIE R&S
CCIE C&S
CCIE Written Exam Objectives
CCIE R&S Written Exam Objectives
CCIE C&S Written Exam General Knowledge Objectives
Test Preparation, Test-Taking Tips, and Using This Book
Chapter 2 Networking Concepts Review
“Do I Know This Already?” Quiz
Foundation Topics
The OSI Reference Model
Physical Layer (OS! Layer 1)
Data-Link Layer (OSI Layer 2)
Network Layer (OSI Layer 3)
Transport Layer (OSI Layer 4)
Session Layer (OSI Layer 5)
Presentation Layer (OSI Layer 6)
Application Layer (OSI Layer 7)
Example of Layered Communication
Numeric Conversion
Hexadecimal Numbers
Binary Numbers
General Routing Concepts
Hierarchical Model for Networks
Basic Intemetworking Devices
Routing Protocol Characteristics
References Used
Foundation Summary
Q&A
Scenario
Chapter 3 Cisco Equipment Operations
“Do I Know This Already?” Quiz
Foundation Topics
Infrastructure
Central Processing Unit (CPU)
Primary Memory
Nonvolatile RAM (NVRAM)
Read-Only Memory (ROM)
Boot Flash
Flash Memory
Configuration Register
Router Modes
ROM Monitor
Boot Mode
User Exec Mode
Privileged Exec Mode
Configuration Mode
Initial Configuration Dialog
Router Operations
Password Security
TFrP
Configuration File Manipulation
Password Recovery
Accessing Devices
Router CLI
Debug
Switch Commands
References Used
Foundation Summary
Q&A
Scenario
Chapter 4 Local-Area Networks and LAN Switching
Chapter 5 Wide-Area Networks
Chapter 6 Internet Protocols
Chapter 7 Static Routing and Distance Vector Routing Protocols
Chapter 8 IP Link-State Routing Protocols
Chapter 9 Border Gateway Protocol
Chapter 10 Administrative Distance, Access Lists, Route Manipulation, and IP Chapter 11 Traffic Management
Chapter 12 Multiservice Networking, IPX Networking, and Security
Appendix Answers to Quiz Questions
Chapter 2 Answers to Q & A Section
Chapter 2 Answers to Scenario Section
Chapter 3 Answers to Q & A Section
Chapter 3 Answers to Scenario Section
Chapter 4 Answers to Q & A Section
Chapter 4 Answers to Scenario Section
Chapter 5 Answers to Q & A Section
Chapter 5 Answers to Scenario Section
Chapter 6 Answers to Q & A Section
Chapter 6 Answers to Scenario Section
Chapter 7 Answers to Q & A Section
Chapter 7 Answers to Scenario Section
Chapter 8 Answers to Q & A Section
Chapter 8 Answers to Scenario Section
Chapter 9 Answers to Q & A Section
Chapter 9 Answers to Scenario Section
Chapter 10 Answers to Q & A Section
Chapter 10 Answers to Scenario Section
Chapter 11 Answers to Q & A Section
Chapter 11 Answers to Scenario Section
Chapter 12 Answers to Q & A Section
Chapter 12 Answers to Scenario Section
Index

通过本书，你可以了解关于CCIE路由与交换笔试以及通信与服务笔试所涉及的全部知识点：
一般路由概念，如OSI模型、网络互连设备以及路由选择协议的特点等。快速以太网，吉比特以太网和无线局域网。透明桥接、VLAN和VLAN中继.帧中继、ATM和SONET/SDH。RIP、IGRP、ELGRP。OSPF和IS-IS。BGP、路由反射器和联盟。队列、MPLS、CAR和流量整形。IP多播、IP优先级和多服务网络。防火墙、加密以及其它的**主题。
CCIE是网络界粂手可热的认证。获取CCIE认证非常困难，因而在业界拥有无**拟的声誉。要准备CCIE考试，你必须花大量的时间学习广泛的技术知识，进而在现实网络中加以实践，然后才可以去参加CCIE路由与交换的笔试。本书涵盖了CCIE路由与交换以及通信与服务笔试要求的所有知识点，包括网络理论、设备操作、桥接和局域网交换，WAN、IP和IP路由选择协议、**性及多业务网络。
本书由CCIE们编写和审校，有助于你理解和掌握通过考试必需的知识。通过每个章节关于每个知识点的小测验，可以优化你的学习时间。每章的*后提供了关键概念的回顾，有助于加强记忆。每章的“问题与答案”可以检验你对知识的理解程度，并且可以在一系列场景中，检验你对知识的吸收和利用。随书的光盘中有模拟测验，包含200多道测验题，你可以选择感兴趣的专题。加上经验和培训，这本书可以让你掌握CCIE笔试所需的知识，从而向CCIE进一步靠近。