本书包含有关路由模型，进程和设计的翔实的技术细节，可以作为设计，实现或支持基于TCP、IP、IPX、SPX，APPLETALK，SNA，DECNET和BANYAN VINES协议的网络互连的参考手册。本书主要包括三部分：介绍网络互连的相关概念和理论，主要介绍物理层，数据链路层，网络层的协议以及基本路由器的配置；详细介绍TCP、IP协议，也包括NOVEL IPX，APPLETALK协议的配置方法等；介绍WAN的通信，包括WAN的连接，X25和帧中继的配置等。
本书特别适合于参加CCNA考试的读者。Cisco公司把本书作为CCNA的正式课本。对于其他读者，本书可以使他们增加对影响网络通信和安全的基础理论的理解。
PART 1 INTRODUCTION TO INTERNETWORKING
Chapter 1 The Internetworking Model
Chapter 2 Applications and Upper Layers
Chapter 3 Physical and Data Link Layers
Chapter 4 Network Layer and Path Determination
Chapter 5 Basic Router Operations
Chapter 6 Configuring a Router
Chapter 7 Discovering and Accessing Other Cisco Routers
PART 2 NETWORKING PROTOCOL SUITES
Chapter 8 TCP/IP Overview
Chapter 9 IP Addressing
Chapter 10 IP Routing Configuration
Chapter 11 Configuring Novell IPX
Chapter 12 Configuring Apple Talk
Chapter 13 Basic Traffic Management with Access Lists
PART 3 WIDE-AREA NETWORKING
Chapter 14 Introduction to WAN Connections
Chapter 15 Configuring X.25
Chapter 16 Configuring Frame Relay
APPENDIXES
The strategic importance of interconnected networks was quickly realized,Organizations began to move toward linking previously isolated LANs,as shown in Figure 1-2.
