本书详细介绍CCNA考试的内容，主要有：互连网络的模型、Cisco路由器、交换机和集线器的特点；Cisco IOS软件的初步知识；TCP/IP协议套件的综合概括；管理广域网，配置ISDN、帧中继和ATM；学习IP配置；Novell IPX协议栈、IPX封装类型和SAP及RIP的配置；使用访问表进行基本的通信量管理；默认的局域网连网，跨域配置VLAN。 在每一章中，均有针对认证目标的详细说明、有关认证的总结信息、2分钟练习和自我测试题，可帮助读者更好地理解认证的内容。 -book CCNA detailed examination of the contents, including : network interconnection model, Cisco routers, switches and hubs characteristics; Cisco IOS software preliminary knowledge; TCP / IP protocol suite summarize; WAN management, configuration ISDN, fr a me Relay and ATM; Learning IP configuration; Novell IPX protocol stack, IPX Packaging type and SAP and RIP configuration; Use Form visit the basic traffic management; the default LAN networking, cross-border VLAN configuration. In each chapter, there is the goal against certification details, a summary of the authentication information, 2-minute exercises and self-tests that will help readers gain a better understanding of the contents of certification.