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Jingdong book

思科网络技术学院教程：连接网络

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Jingdong book

思科网络技术学院教程：连接网络

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思科网络技术学院CCNA路由和交换课程中"连接网络"课程的官方补充教材。
本课程介绍了聚合应用在复杂网络中所需要的WAN技术和网络服务。本课程可以让读者理解如何选择网络设备和WAN技术，以满足网络需求。读者还将学到配置和排错网络设备以及解决与数据链路协议相关的常见问题等知识，还将掌握在复杂网络中实施IPSec和VPN所需的知识和技巧。

本书旨在作为方便的案头参考书供学生随时随地使用，以巩固课程内容，充分利用学习时间。
本书的特色有助于读者将重点放在重要概念上，从而成功地完成该课程的练习。
目标——通过回答每章开篇列出的重要问题复习核心概念。
重要术语——每章开篇列出了本章中涉及的重要术语，引起读者重视。
术语表——全面的术语表定义了大约195个重要术语。
练习和实验——在每章末尾列出了所有相关的练习和实验，极大限度地为读者节省时间。
复习题——每章末尾的复习题采用与在线课程中的问题相同的风格，帮助读者评估学习效果。附录提供了答案并做了解释。

How to——该图标标识执行特定任务所需的步骤。
练习——该图标标识来自在线课程的所有练习，这些练习旨在加深读者对主题的理解。
视频——观看在线课程中的视频。
Packet Tracer练习——使用贯穿本书的Packet Tracer练习以可视化方式探索网络概念。
实验——完成可在本课程和实验手册中找到的所有实验和课堂练习。
Content Description

思科网络技术学院项目是思科公司在全球范围内推出的一个主要面向初级网络工程技术人员的培训项目，旨在让更多的年轻人学习先进的网络技术知识，为互联网时代做好准备。《思科网络技术学院教程：连接网络》是思科网络技术学院全新版本的配套书面教材，主要内容包括分层的网络设计、连接到WAN、点对点连接、帧中继、IPv4的网络地址转换、宽带解决方案、保护站点到站点连接、监控网络、排除网络故障等内容。本书每章后还提供了复习题，并在附录中给出了答案和解释，以检验读者每章知识的掌握情况。术语表描述了网络有关的术语，并给出了相应的解释。《思科网络技术学院教程：连接网络》适合准备参加CCNA认证考试的读者以及各类网络技术初学人员参考阅读。
Author Description

Rick Graziani，在加州Aptos的坎布里恩大学教授计算机科学和计算机网络课程。在此之前，他在很多公司从事过IT工作，其中包括Santa Cruz Operation、Tandem Computers和Lockheed Missiles and Space Corporation。他拥有加州州立大学蒙特里分校的计算机科学和系统理论的硕士学位。自1999年以来，Rick还是思科网络技术学院课程开发团队的成员之一。Rick已经在Cisco Press出版了多部书籍，并为思科网络技术学院开发了多门在线课程。Rick是Cisco Press出版的IPv6 Fundamentals一书（该书中文版《IPv6技术精要》由人民邮电出版社出版）的作者，并在思科学院会议上就IPv6发表过演讲。他还是Cisco Press出版的Routing Protocols Companion Guide的合著者。闲暇之余，Rick很有可能在他喜欢的圣克鲁斯冲浪圣地冲浪。
Bob Vachon，是加拿大安大略省萨德伯里市坎布里恩大学的计算机系统技术项目的教授，并教授网络基础设施课程。他拥有超过30年的计算机网络和信息技术领域的工作和教学经验。自2001年起，Bob已在思科公司和思科网络技术学院的多个CCNA、CCNA-S和CCNP项目中担任团队领导人、作者和项目事务专家。他还创作出版了CCNA Accessing the WAN Companion Guide和CCNA Security（640-554）Portable Command Guide。他还是Cisco Press出版的Routing Protocols Companion Guide一书的合著者。在闲暇时间，Bob喜欢弹吉他、投标枪或打台球，还喜欢从事园艺工作或乘坐独木舟旅行。
Catalogue

第1章分层的网络设计 1
1．1分层网络设计概述 2
1．1．1企业园区网络设计 2
1．1．2分层的网络设计 3
1．2思科企业体系结构 7
1．2．1模块化设计 8
1．2．2企业体系架构中的模块 8
1．3思科企业体系架构模型 10
1．3．1思科企业体系架构模型 10
1．3．2思科企业园区 11
1．3．3思科企业边缘 12
1．3．4服务提供商边缘 13
1．3．5远程功能区 15
1．4不断发展的网络架构 16
1．4．1IT挑战 16
1．4．2新兴企业架构 17
1．5新兴网络架构 17
1．5．1思科边界网络 17
1．5．2协作架构 18
1．5．3数据中心与虚拟化 19
1．5．4扩展网络 20
1．6总结 20
1．7练习 21
1．7．1课堂练习 21
1．7．2Packet Tracer练习 21
1．8检查你的理解 21

第2章连接到WAN 24
2．1WAN技术概述 25
2．1．1为什么选择WAN 25
2．1．2WAN是否必要 26
2．1．3不断发展的网络 26
2．1．4小型办公室 26
2．1．5园区网络 27
2．1．6分支机构网络 28
2．1．7分布式网络 29
2．2WAN运营 30
2．2．1OSI模型中的WAN 30
2．2．2常见WAN术语 30
2．2．3WAN设备 31
2．2．4电路交换 33
2．2．5分组交换 33
2．3选择WAN技术 34
2．3．1WAN链路连接方案 34
2．3．2服务提供商网络基础设施 35
2．4私有WAN基础设施 36
2．4．1租用线路 37
2．4．2拨号 37
2．4．3ISDN 38
2．4．4帧中继 40
2．4．5ATM 41
2．4．6以太网WAN 41
2．4．7MPLS 42
2．4．8VSAT 43
2．5公共WAN基础设施 44
2．5．1DSL 44
2．5．2有线电视 44
2．5．3线介质 45
2．5．43G/4G蜂窝网 46
2．5．5VPN技术 47
2．6选择WAN服务 48
2．7总结 50
2．8练习 50
2．8．1课堂练习 50
2．8．2实验 51
2．9检查你的理解 51

第3章点对点连接 53
3．1串行点对点概述 54
3．1．1串行通信 54
3．1．2HDLC封装 64
3．2PPP操作 69
3．2．1PPP的优势 69
3．2．2LCP和NCP 70
3．2．3PPP会话数 73
3．3配置PPP 79
3．3．1配置PPP 79
3．3．2PPP身份验证 84
3．4WAN连接故障排除 93
3．5总结 97
3．6练习 98
3．6．1课堂练习 98
3．6．2实验 98
3．7检查你的理解 98

第4章帧中继 102
4．1帧中继简介 103
4．1．1帧中继优势 103
4．1．2帧中继的工作原理 107
4．1．3高级帧中继概念 121
4．2配置帧中继 125
4．2．1配置基本帧中继 125
4．2．2配置子接口 129
4．3排除连接故障 136
排除帧中继故障 136
4．4总结 140
4．5练习 141
4．5．1课堂练习 141
4．5．2实验 141
4．5．3Packet Tracer练习 141
4．6检查你的理解 141

第5章IPv4的网络地址转换 146
5．1NAT工作原理 147
5．1．1NAT的特征 147
5．1．2NAT类型 152
5．1．3NAT的优点 156
5．2配置NAT 157
5．2．1配置静态NAT 157
5．2．2配置动态NAT 161
5．2．3配置端口地址转换（PAT） 167
5．2．4端口转发 172
5．2．5配置NAT和IPv6 176
5．3NAT故障排除 179
5．3．1NAT故障排除：show
命令 179
5．3．2NAT故障排除：debug
命令 180
5．3．3案例研究 182
5．4总结 184
5．5练习 185
5．5．1课堂练习 185
5．5．2实验 185
5．5．3Packet Tracer练习 185
5．6检查你的理解 185

第6章宽带解决方案 190
6．1远程办公 191
6．1．1远程办公的好处 191
6．1．2远程工作人员服务的业务
需求 193
6．2比较宽带解决方案 195
6．2．1有线 195
6．2．2DSL 199
6．2．3线宽带 202
6．2．4选择宽带解决方案 205
6．3配置xDSL连接 206
6．3．1PPPoE概述 206
6．3．2配置PPPoE 208
6．4总结 209
6．5练习 209
6．5．1课堂练习 210
6．5．2实验 210
6．6检查你的理解 210

第7章保护站点到站点连接 212
7．1VPN 213
7．1．1VPN的基本原理 213
7．1．2VPN的类型 215
7．2站点到站点GRE隧道 216
7．2．1通用路由封装的基本原理 217
7．2．2配置GRE隧道 218
7．3IPSec简介 221
7．3．1Internet协议安全性 221
7．3．2IPSec框架 223
7．4远程访问 228
7．4．1远程访问VPN解决方案 228
7．4．2IPSec远程访问VPN 232
7．5总结 235
7．6练习 235
7．6．1课堂练习 236
7．6．2实验 236
7．6．3Packet Tracer练习 236
7．7检查你的理解 236

第8章监控网络 238
8．1系统日志 239
8．1．1系统日志工作原理 239
8．1．2配置系统日志 243
8．2SNMP 247
8．2．1SNMP工作原理 247
8．2．2配置SNMP 254
8．3NetFlow 259
8．3．1NetFlow运行 259
8．3．2配置NetFlow 261
8．3．3检查流量模式 265
8．4总结 270
8．5练习 270
8．5．1课堂练习 270
8．5．2实验 270
8．5．3Packet Tracer练习 271
8．6检查你的理解 271

第9章排除网络故障 273
9．1使用系统化的方法进行故障
排除 274
9．1．1网络文档 274
9．1．2故障排除过程 282
9．1．3采用分层模型来隔离问题 285
9．2网络故障排除 290
9．2．1故障排除工具 290
9．2．2网络故障排除的症状和
原因 297
9．2．3排除IP连接故障 304
9．3总结 322
9．4练习 322
9．5检查你的理解 323
附录A“检查你的理解”问题答案 325
术语表 336

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