network Fundamentals, Ccna Exploration Companion Guide Is The Official Supplemental Textbook For The Network Fundamentals Course In The Cisco® Networking Academy® Ccna® Exploration Curriculum Version 4. The Course, The First Of Four In The New Curriculum, Is Based On A Top-down Approach To Networking. The companion Guide , Written And Edited By Networking Academy Instructors, Is Designed As A Portable Desk Reference To Use Anytime, Anywhere. The Book’s Features Reinforce The Material In The Course To Help You Focus On Important Concepts And Organize Your Study Time For Exams. new And Improved Features Help You Study And Succeed In This Course: chapter Objectives —review Core Concepts By Answering The Focus Questions Listed At The Beginning Of Each Chapter. key Terms —refer To The Updated Lists Of Networking Vocabulary Introduced And Highlighted In Context In Each Chapter. glossary —consult The Comprehensive Glossary With More Than 250 Terms. check Your Understanding Questions And Answer Key —evaluate Your Readiness With The Updated End-of-chapter Questions That Match The Style Of Questions You See On The Online Course Quizzes. The Answer Key Explains Each Answer. challenge Questions And Activities —strive To Ace More Challenging Review Questions And Activities Designed To Prepare You For The Complex Styles Of Questions You Might See On The Ccna Exam. The Answer Key Explains Each Answer. how To—look For This Icon To Study The Steps You Need To Learn To Perform Certain Tasks. packet Tracer Activities— Explore Networking Concepts In Activities Interspersed Throughout Some Chapters Using packet Tracer V4.1 Developed By Cisco. The Files For These Activities Are On The Accompanying Cd-rom. also Available For The Network Fundamentals Course network Fundamentals, Ccna Exploration Labs And Study Guide isbn-10: 1-58713-203-6 isbn-13: 978-1-58713-203-2 companion Cd-rom the Cd-rom Provides Many Useful Tools And Information To Support Your Education: packet Tracer Activity Exercise Files V4.1 vlsm Subnetting Chart structured Cabling Exploration Supplement taking Notes: A .txt File Of The Chapter Objectives a Guide To Using A Networker’s Journal Booklet it Career Information tips On Lifelong Learning In Networking this Book Is Part Of The Cisco Networking Academy Series From Cisco Press®. The Products In This Series Support And Complement The Cisco Networking Academy Online Curriculum.

zlib/no-category/[美]Mark A.Dye Rick McDonald Antoon W.Rufi/思科网络技术学院教程 CCNA Exploration：网络基础知识_21031163.mobi

思科网络技术学院教程CCNA Exploration = CCNA exploration companion guide / 网络基础知识Network fundamentals

Network Fundamentals, CCNA Exploration Companion Guide (2nd Edition) (Companion Guide)

(美)Mark A. Dye, (美)Rick McDonald, (美)Antoon W. Rufi著 ; 思科系统公司译; 戴伊; 麦克唐纳; 拉菲; 思科系统公司

Mark Dye, Rick McDonald, Antoon Rufi, Mark A. Dye, Antoon W. Rufi

Dye, Mark A., Mcdonald, Rick, Rufi, Antoon W.

Mark A. Dye, Antoon W. Rufi, Rick McDonald

美 Mark A.Dye Rick McDonald Antoon W.Rufi

戴伊 (Dye, Mark A.)

The People's Posts and Telecommunications Publishing House

Cisco Academic

Cisco Systems

Cisco Press

北京:人民邮电出版社

Cisco Networking Academy series, Indianapolis, 2007

United States, United States of America

China, People's Republic, China

Indianapolis, Ind, USA, 2008

1st, First Edition, FR, 2007

2 edition, November 8, 2007

Di 1 ban, Beijing, 2009

Bei jing, 2009

uuuu

Includes index.

Bookmarks: p1 (p1): 第1章 生活在以网络为中心的世界里
p2 (p1): 1.1 目标
p3 (p1): 1.2 关键术语
p4 (p2): 1.3 在以网络为中心的世界相互通信
p5 (p2): 1.3.1 网络支撑着我们的生活方式
p6 (p3): 1.3.2 当今最常用的几种通信工具
p7 (p3): 1.3.3 网络支撑着我们的学习方式
p8 (p4): 1.3.4 网络支撑着我们的工作方式
p9 (p5): 1.3.5 网络支撑着我们娱乐的方式
p10 (p5): 1.4 通信：生活中不可或缺的一部分
p11 (p6): 1.4.1 何为通信
p12 (p6): 1.4.2 通信质量
p13 (p6): 1.5 网络作为一个平台
p14 (p7): 1.5.1 通过网络通信
p15 (p7): 1.5.2 网络要素
p16 (p9): 1.5.3 融合网络
p17 (p10): 1.6 Internet的体系结构
p18 (p10): 1.6.1 网络体系结构
p19 (p11): 1.6.2 具备容错能力的网络体系结构
p20 (p13): 1.6.3 可扩展网络体系结构
p21 (p13): 1.6.4 提供服务质量
p22 (p15): 1.6.5 提供网络安全保障
p23 (p16): 1.7 网络趋势
p24 (p16): 1.7.1 它的发展方向是什么？
p25 (p17): 1.7.2 网络行业就业机会
p26 (p17): 1.8 总结
p27 (p18): 1.9 实验
p28 (p18): 1.10 检查你的理解
p29 (p20): 1.11 挑战的问题和实践
p30 (p20): 1.12 知识拓展
p31 (p21): 第2章 网络通信
p32 (p21): 2.1 目标
p33 (p21): 2.2 关键术语
p34 (p22): 2.3 通信的平台
p35 (p22): 2.3.1 通信要素
p36 (p23): 2.3.2 传送消息
p37 (p23): 2.3.3 网络的组成部分
p38 (p24): 2.3.4 终端设备及其在网络中的作用
p39 (p24): 2.3.5 中间设备及其在网络中的作用
p40 (p25): 2.3.6 网络介质
p41 (p26): 2.4 局域网、广域网和网际网络
p42 (p26): 2.4.1 局域网
p43 (p26): 2.4.2 广域网
p44 (p26): 2.4.3 Internet：由多个网络组成的网络
p45 (p27): 2.4.4 网络表示方式
p46 (p28): 2.5 协议
p47 (p28): 2.5.1 用于规范通信的规则
p48 (p29): 2.5.2 网络协议
p49 (p29): 2.5.3 协议族和行业标准
p50 (p29): 2.5.4 协议的交互
p51 (p30): 2.5.5 技术无关协议
p52 (p30): 2.6 使用分层模型
p53 (p30): 2.6.1 使用分层模型的优点
p54 (p31): 2.6.2 协议和参考模型
p55 (p31): 2.6.3 TCP/IP模型
p56 (p32): 2.6.4 通信的过程
p57 (p32): 2.6.5 协议数据单元和封装
p58 (p33): 2.6.6 发送和接收过程
p59 (p33): 2.6.7 OSI模型
p60 (p34): 2.6.8 比较OSI模型与TCP/IP模型
p61 (p35): 2.7 网络编址
p62 (p35): 2.7.1 网络中的编址
p63 (p35): 2.7.2 数据送达终端设备
p64 (p35): 2.7.3 通过网际网络获得数据
p65 (p36): 2.7.4 数据到达正确的应用程序
p66 (p37): 2.8 总结
p67 (p37): 2.9 实验
p68 (p37): 2.10 检查你的理解
p69 (p39): 2.11 挑战的问题和实践
p70 (p39): 2.12 知识拓展
p71 (p41): 第3章 应用层功能及协议
p72 (p41): 3.1 目标
p73 (p41): 3.2 关键术语
p74 (p42): 3.3 应用程序：网络间的接口
p75 (p42): 3.3.1 OSI模型及TCP/IP模型
p76 (p44): 3.3.2 应用层软件
p77 (p45): 3.3.3 用户应用程序、服务以及应用层协议
p78 (p45): 3.3.4 应用层协议功能
p79 (p46): 3.4 准备应用程序和服务
p80 (p46): 3.4.1 客户端——服务器模型
p81 (p46): 3.4.2 服务器
p82 (p47): 3.4.3 应用层服务及协议
p83 (p48): 3.4.4 点对点网络及应用程序
p84 (p49): 3.5 应用层协议及服务实例
p85 (p50): 3.5.1 DNS服务及协议
p86 (p53): 3.5.2 WWW服务及HTTP
p87 (p54): 3.5.3 电子邮件服务及SMTP/POP协议
p88 (p55): 3.5.4 电子邮件服务器进程——MTA及MDA
p89 (p56): 3.5.5 FTP
p90 (p57): 3.5.6 DHCP
p91 (p58): 3.5.7 文件共享服务及SMB协议
p92 (p59): 3.5.8 P2P服务和Gnutella协议
p93 (p60): 3.5.9 Telnet服务及协议
p94 (p61): 3.6 总结
p95 (p61): 3.7 实验
p96 (p62): 3.8 检查你的理解
p97 (p63): 3.9 挑战的问题和实践
p98 (p64): 3.10 知识拓展
p99 (p65): 第4章 OSI传输层
p100 (p65): 4.1 目标
p101 (p65): 4.2 关键术语
p102 (p66): 4.3 传输层的作用
p103 (p66): 4.3.1 传输层的用途
p104 (p69): 4.3.2 支持可靠通信
p105 (p70): 4.3.3 TCP和UDP
p106 (p71): 4.3.4 端口寻址
p107 (p74): 4.3.5 分段和重组：分治法
p108 (p75): 4.4 TCP：可靠通信
p109 (p75): 4.4.1 创建可靠会话
p110 (p76): 4.4.2 TCP服务器进程
p111 (p76): 4.4.3 TCP连接的建立和终止
p112 (p76): 4.4.4 三次握手
p113 (p78): 4.4.5 TCP会话终止
p114 (p79): 4.4.6 TCP窗口确认
p115 (p80): 4.4.7 TCP重传
p116 (p80): 4.4.8 TCP拥塞控制：将可能丢失的数据段降到最少
p117 (p81): 4.5 UDP协议：低开销通信
p118 (p81): 4.5.1 UDP：低开销与可靠性对比
p119 (p82): 4.5.2 UDP数据报重组
p120 (p82): 4.5.3 UDP服务器进程与请求
p121 (p82): 4.5.4 UDP客户端进程
p122 (p83): 4.6 总结
p123 (p84): 4.7 实验
p124 (p84): 4.8 检查你的理解
p125 (p86): 4.9 挑战的问题和实践
p126 (p86): 4.10 知识拓展
p127 (p87): 第5章 OSI网络层
p128 (p87): 5.1 学习目标
p129 (p87): 5.2 关键术语
p130 (p88): 5.3 IPv4地址
p131 (p88): 5.3.1 网络层：从主机到主机的通信
p132 (p90): 5.3.2 IPv4：网络层协议的例子
p133 (p92): 5.3.3 IPv4数据包：封装传输层PDU
p134 (p92): 5.3.4 IPv4数据包头
p135 (p93): 5.4 网络：将主机分组
p136 (p93): 5.4.1 建立通用分组
p137 (p95): 5.4.2 为何将主机划分为网络？
p138 (p97): 5.4.3 从网络划分网络
p139 (p98): 5.5 路由：数据包如何被处理
p140 (p98): 5.5.1 设备参数：支持网络外部通信
p141 (p98): 5.5.2 IP数据包：端到端传送数据
p142 (p99): 5.5.3 网关：网络的出口
p143 (p100): 5.5.4 路由：通往网络的路径
p144 (p102): 5.5.5 目的网络
p145 (p103): 5.5.6 下一跳：数据包下一步去哪
p146 (p103): 5.5.7 数据包转发：将数据包发往目的
p147 (p104): 5.6 路由过程：如何学习路由
p148 (p104): 5.6.1 静态路由
p149 (p104): 5.6.2 动态路由
p150 (p105): 5.6.3 路由协议
p151 (p106): 5.7 总结
p152 (p106): 5.8 试验
p153 (p107): 5.9 检查你的理解
p154 (p108): 5.10 挑战问题和实践
p155 (p109): 5.11 知识拓展
p156 (p110): 第6章 网络编址：IPv4
p157 (p110): 6.1 学习目标
p158 (p110): 6.2 关键术语
p159 (p111): 6.3 IPv4地址
p160 (p111): 6.3.1 IPv4地址剖析
p161 (p112): 6.3.2 二进制与十进制数之间的转换
p162 (p114): 6.3.3 十进制到二进制的转换
p163 (p118): 6.3.4 通信的编址类型：单播、广播、多播
p164 (p121): 6.4 不同用途的IPv4地址
p165 (p121): 6.4.1 IPv4网络范围内的不同类型地址
p166 (p122): 6.4.2 子网掩码：定义地址的网络和主机部分
p167 (p123): 6.4.3 公用地址和私用地址
p168 (p124): 6.4.4 特殊的单播IPv4地址
p169 (p125): 6.4.5 传统IPv4编址
p170 (p127): 6.5 地址分配
p171 (p127): 6.5.1 规划网络地址
p172 (p128): 6.5.2 最终用户设备的静态和动态地址
p173 (p129): 6.5.3 选择设备地址
p174 (p130): 6.5.4 Internet地址分配机构（IANA）
p175 (p131): 6.5.5 ISP
p176 (p132): 6.6 计算地址
p177 (p132): 6.6.1 这台主机在我的网络上吗？
p178 (p133): 6.6.2 计算网络、主机和广播地址
p179 (p135): 6.6.3 基本子网
p180 (p138): 6.6.4 子网划分：将网络划分为适当大小
p181 (p140): 6.6.5 细分子网
p182 (p145): 6.7 测试网络层
p183 (p146): 6.7.1 ping 127.0.0.1：测试本地协议族
p184 (p146): 6.7.2 ping网关：测试到本地网络的连通性
p185 (p146): 6.7.3 ping远程主机：测试到远程网络的连通性
p186 (p147): 6.7.4 traceroute（tracert）：测试路径
p187 (p149): 6.7.5 ICMPv4：支持测试和消息的协议
p188 (p150): 6.7.6 IPv6概述
p189 (p151): 6.8 总结
p190 (p151): 6.9 试验
p191 (p152): 6.10 检查你的理解
p192 (p153): 6.11 挑战问题和实践
p193 (p153): 6.12 知识拓展
p194 (p154): 第7章 OSI数据链路层
p195 (p154): 7.1 学习目标
p196 (p154): 7.2 关键术语
p197 (p155): 7.3 数据链路层：访问介质
p198 (p155): 7.3.1 支持和连接上层服务
p199 (p156): 7.3.2 控制通过本地介质的传输
p200 (p157): 7.3.3 创建帧
p201 (p158): 7.3.4 将上层服务连接到介质
p202 (p159): 7.3.5 标准
p203 (p159): 7.4 MAC技术：将数据放入介质
p204 (p159): 7.4.1 共享介质的MAC
p205 (p161): 7.4.2 无共享介质的MAC
p206 (p161): 7.4.3 逻辑拓扑与物理拓扑
p207 (p163): 7.5 MAC：编址和数据封装成帧
p208 (p163): 7.5.1 数据链路层协议：帧
p209 (p164): 7.5.2 封装成帧：帧头的作用
p210 (p164): 7.5.3 编址：帧的去向
p211 (p165): 7.5.4 封装成帧：帧尾的作用
p212 (p165): 7.5.5 数据链路层帧示例
p213 (p169): 7.6 汇总：跟踪通过Internet的数据传输
p214 (p172): 7.7 总结
p215 (p173): 7.8 试验
p216 (p173): 7.9 检查你的理解
p217 (p174): 7.10 挑战问题和实践
p218 (p174): 7.11 知识拓展
p219 (p176): 第8章 OSI物理层
p220 (p176): 8.1 学习目标
p221 (p176): 8.2 关键术语
p222 (p177): 8.3 物理层：通信信号
p223 (p177): 8.3.1 物理层的用途
p224 (p177): 8.3.2 物理层操作
p225 (p178): 8.3.3 物理层标准
p226 (p178): 8.3.4 物理层的基本原则
p227 (p179): 8.4 物理层信号和编码：表示比特
p228 (p179): 8.4.1 用于介质的信号比特
p229 (p181): 8.4.2 编码：比特分组
p230 (p182): 8.4.3 数据传输能力
p231 (p183): 8.5 物理介质：连接通信
p232 (p183): 8.5.1 物理介质的类型
p233 (p184): 8.5.2 铜介质
p234 (p187): 8.5.3 光纤介质
p235 (p189): 8.5.4 无线介质
p236 (p190): 8.5.5 介质连接器
p237 (p191): 8.6 总结
p238 (p191): 8.7 试验
p239 (p192): 8.8 检查你的理解
p240 (p193): 8.9 挑战问题和实践
p241 (p194): 8.10 知识拓展
p242 (p195): 第9章 以太网
p243 (p195): 9.1 学习目标
p244 (p195): 9.2 关键术语
p245 (p196): 9.3 以太网概述
p246 (p196): 9.3.1 以太网：标准和实施
p247 (p196): 9.3.2 以太网：第1层和第2层
p248 (p197): 9.3.3 逻辑链路控制：连接上层
p249 (p197): 9.3.4 MAC：获取送到介质的数据
p250 (p198): 9.3.5 以太网的物理层实现
p251 (p198): 9.4 以太网：通过LAN通信
p252 (p199): 9.4.1 以太网历史
p253 (p199): 9.4.2 传统以太网
p254 (p200): 9.4.3 当前的以太网
p255 (p200): 9.4.4 发展到1Gbit/s及以上速度
p256 (p201): 9.5 以太网帧
p257 (p201): 9.5.1 帧：封装数据包
p258 (p202): 9.5.2 以太网MAC地址
p259 (p203): 9.5.3 十六进制计数和编址
p260 (p205): 9.5.4 另一层的地址
p261 (p205): 9.5.5 以太网单播、多播和广播
p262 (p207): 9.6 以太网MAC
p263 (p207): 9.6.1 以太网中的MAC
p264 (p207): 9.6.2 CSMA/CD：过程
p265 (p209): 9.6.3 以太网定时
p266 (p211): 9.6.4 帧间隙和回退
p267 (p212): 9.7 以太网物理层
p268 (p212): 9.7.1 10Mbit/s和100Mbit/s以太网
p269 (p213): 9.7.2 吉比特以太网
p270 (p214): 9.7.3 以太网：未来的选择
p271 (p215): 9.8 集线器和交换机
p272 (p215): 9.8.1 传统以太网：使用集线器
p273 (p216): 9.8.2 以太网：使用交换机
p274 (p217): 9.8.3 交换：选择性转发
p275 (p219): 9.9 地址解析协议（ARP）
p276 (p219): 9.9.1 将IPv4地址解析为MAC地址
p277 (p220): 9.9.2 维护映射缓存
p278 (p222): 9.9.3 删除地址映射
p279 (p223): 9.9.4 ARP广播问题
p280 (p223): 9.10 总结
p281 (p223): 9.11 试验
p282 (p224): 9.12 检查你的理解
p283 (p225): 9.13 挑战问题和实践
p284 (p225): 9.14 知识拓展
p285 (p226): 第10章 网络规划和布线
p286 (p226): 10.1 学习目标
p287 (p226): 10.2 关键术语
p288 (p227): 10.3 LAN：进行物理连接
p289 (p227): 10.3.1 选择正确的LAN设备
p290 (p228): 10.3.2 设备选择因素
p291 (p230): 10.4 设备互连
p292 (p230): 10.4.1 LAN和WAN：实现连接
p293 (p234): 10.4.2 进行LAN连接
p294 (p237): 10.4.3 进行WAN连接
p295 (p239): 10.5 制定编址方案
p296 (p240): 10.5.1 网络上有多少主机？
p297 (p240): 10.5.2 有多少网络？
p298 (p241): 10.5.3 设计网络地址的标准
p299 (p242): 10.6 计算子网
p300 (p242): 10.6.1 计算地址：例1
p301 (p245): 10.6.2 计算地址：例2
p302 (p246): 10.7 设备互连
p303 (p246): 10.7.1 设备接口
p304 (p247): 10.7.2 进行设备的管理连接
p305 (p248): 10.8 总结
p306 (p249): 10.9 试验
p307 (p249): 10.10 检查你的理解
p308 (p250): 10.11 挑战问题和实践
p309 (p252): 10.12 知识拓展
p310 (p253): 第11章 配置和测试网络
p311 (p253): 11.1 学习目标
p312 (p253): 11.2 关键术语
p313 (p254): 11.3 配置Cisco设备：IOS基础
p314 (p254): 11.3.1 Cisco IOS
p315 (p254): 11.3.2 访问方法
p316 (p256): 11.3.3 配置文件
p317 (p257): 11.3.4 介绍Cisco IOS模式
p318 (p259): 11.3.5 基本IOS命令结构
p319 (p260): 11.3.6 使用CLI帮助
p320 (p264): 11.3.7 IOS检查命令
p321 (p266): 11.3.8 IOS配置模式
p322 (p266): 11.4 利用Cisco IOS进行基本配置
p323 (p266): 11.4.1 命名设备
p324 (p268): 11.4.2 限制设备访问：配置口令和标语
p325 (p271): 11.4.3 管理配置文件
p326 (p274): 11.4.4 配置接口
p327 (p276): 11.5 校验连通性
p328 (p276): 11.5.1 验证协议族
p329 (p277): 11.5.2 测试接口
p330 (p280): 11.5.3 测试本地网络
p331 (p281): 11.5.4 测试网关和远端的连通性
p332 (p282): 11.5.5 trace命令和解释trace命令的结果
p333 (p286): 11.6 监控和记录网络
p334 (p286): 11.6.1 网络基线
p335 (p287): 11.6.2 捕获和解释trace信息
p336 (p288): 11.6.3 了解网络上的节点
p337 (p290): 11.7 总结
p338 (p291): 11.8 试验
p339 (p292): 11.9 检查你的理解
p340 (p293): 11.10 挑战问题和实践
p341 (p293): 11.11 知识拓展
p342 (p294): 附录 检查你的理解和挑战问题答案
p343 (p307): 术语表

Introduction
Living in a Network-Centric World
Objectives
Key Terms
Communicating in a Network-Centric World
Networks Supporting the Way We Live
Examples of Today’s Popular Communication Tools
Networks Supporting the Way We Learn
Networks Supporting the Way We Work
Networks Supporting the Way We Play
Communication: An Essential Part of Our Lives
What Is Communication?
Quality of Communication
The Network as a Platform
Communicating over Networks
Elements of a Network
Converged Networks
The Architecture of the Internet
The Network Architecture
Fault-Tolerant Network Architecture
Scalable Network Architecture
Providing Quality of Service
Providing Network Security
Trends in Networking
Where Is It All Going?
Networking Career Opportunities
Summary
Activities and Labs
Check Your Understanding
Challenge Questions and Activities
To Learn More
Communicating over the Network
Objectives
Key Terms
The Platform for Communications
The Elements of Communication
Communicating the Messages
Components of the Network
End Devices and Their Role on the Network
Intermediary Devices and Their Role on the Network
Network Media
LANs, WANs, and Internetworks
Local-Area Networks
Wide-Area Networks
The Internet: A Network of Networks
Network Representations
Protocols
Rules That Govern Communications
Network Protocols
Protocol Suites and Industry Standards
Interaction of Protocols
Technology-Independent Protocols
Using Layered Models
The Benefits of a Layered Model
Protocol and Reference Models
TCP/IP Model
Communication Process
Protocol Data Units and Encapsulation
Sending and Receiving Process
OSI Model
Comparing the OSI Model to the TCP/IP Model
Network Addressing
Addressing in the Network
Getting Data to the End Device
Getting Data Through the Internetwork
Getting Data to the Right Application
Summary
Activities and Labs
Check Your Understanding
Challenge Questions and Activities
To Learn More
Application Layer Functionality and Protocols
Objectives
Key Terms
Applications: The Interface Between the Networks
OSI and TCP/IP Model
Application Layer Software
User Applications, Services, and Application Layer Protocols
Application Layer Protocol Functions
Making Provisions for Applications and Services
Client/Server Model
Servers
Application Layer Services and Protocols
Peer-to-Peer (P2P) Networking and Applications
Application Layer Protocols and Services Examples
DNS Services and Protocol
WWW Service and HTTP
E-Mail Services and SMTP/POP Protocols
E-Mail Server Processes: MTA and MDA
FTP
DHCP
File-Sharing Services and SMB Protocol
P2P Services and Gnutella Protocol
Telnet Services and Protocol
Summary
Activities and Labs
Check Your Understanding
Challenge Questions and Activities
To Learn More
OSI Transport Layer
Objectives
Key Terms
Roles of the Transport Layer
Purpose of the Transport Layer
Supporting Reliable Communication
TCP and UDP
Port Addressing
Segmentation and Reassembly: Divide and Conquer
TCP: Communicating with Reliability
Making Conversations Reliable
TCP Server Processes
TCP Connection Establishment and Termination
TCP Three-Way Handshake
TCP Session Termination
TCP Acknowledgment with Windowing
TCP Retransmission
TCP Congestion Control: Minimizing Segment Loss
UDP: Communicating with Low Overhead
UDP: Low Overhead Versus Reliability
UDP Datagram Reassembly
UDP Server Processes and Requests
UDP Client Processes
Summary
Labs
Check Your Understanding
Challenge Questions and Activities
To Learn More
OSI Network Layer
Objectives
Key Terms
IPv4
Network Layer: Communication from Host to Host
IPv4: Example Network Layer Protocol
IPv4 Packet: Packaging the Transport Layer PDU
IPv4 Packet Header
Networks: Dividing Hosts into Groups
Creating Common Groups
Why Separate Hosts into Networks?
Dividing Networks from Networks
Routing: How Data Packets Are Handled
Device Parameters: Supporting Communication Outside the Network
IP Packets: Carrying Data End to End
Gateway: The Way Out of the Network
Route: A Path to a Network
Destination Network
Next Hop: Where the Packet Goes Next
Packet Forwarding: Moving the Packet Toward Its Destination
Routing Processes: How Routes Are Learned
Static Routing
Dynamic Routing
Routing Protocols
Summary
Labs
Check Your Understanding
Challenge Questions and Activities
To Learn More
Addressing the Network: IPv4
Objectives
Key Terms
IPv4 Addresses
Anatomy of an IPv4 Address
Binary-to-Decimal Conversion
Decimal-to-Binary Conversions
Addressing Types of Communication: Unicast, Broadcast, Multicast
IPv4 Addresses for Different Purposes
Types of Addresses in an IPv4 Network Range
Subnet Mask: Defining the Network and Host Portions of the Address
Public and Private Addresses
Special Unicast IPv4 Addresses
Legacy IPv4 Addressing
Assigning Addresses
Planning to Address the Network
Static or Dynamic Addressing for End-User Devices
Selecting Device Addresses
Internet Assigned Numbers Authority (IANA)
ISPs
Calculating Addresses
Is the Host on My Network?
Calculating Network, Hosts, and Broadcast Addresses
Basic Subnetting
Subnetting: Dividing Networks into Right Sizes
Subnetting a Subnet
Testing the Network Layer
Ping 127.0.0.1: Testing the Local Stack
Ping Gateway: Testing Connectivity to the Local LAN
Ping Remote Host: Testing Connectivity to Remote LAN
Traceroute (tracert): Testing the Path
ICMPv4: The Protocol Supporting Testing and Messaging
Overview of IPv6
Summary
Labs
Check Your Understanding
Challenge Questions and Activities
To Learn More
OSI Data Link Layer
Objectives
Key Terms
Data Link Layer: Accessing the Media
Supporting and Connecting to Upper-Layer Services
Controlling Transfer Across Local Media
Creating a Frame
Connecting Upper-Layer Services to the Media
Standards
MAC Techniques: Placing Data on the Media
MAC for Shared Media
MAC for Nonshared Media
Logical Topology Versus Physical Topology
MAC: Addressing and Framing Data
Data Link Layer Protocols: The Frame
Framing: Role of the Header
Addressing: Where the Frame Goes
Framing: Role of the Trailer
Sample Data Link Layer Frames
Putting It All Together: Following Data Through an Internetwork
Summary
Labs
Check Your Understanding
Challenge Questions and Activities
To Learn More
OSI Physical Layer
Objectives
Key Terms
Physical Layer: Communication Signals
Purpose of the Physical Layer
Physical Layer Operation
Physical Layer Standards
Physical Layer Fundamental Principles
Physical Signaling and Encoding: Representing Bits
Signaling Bits for the Media
Encoding: Grouping Bits
Data-Carrying Capacity
Physical Media: Connecting Communication
Types of Physical Media
Copper Media
Media Connectors
Summary
Labs
Check Your Understanding
Challenge Questions and Activities
To Learn More
Ethernet
Objectives
Key Terms
Overview of Ethernet
Ethernet: Standards and Implementation
Ethernet: Layer 1 and Layer 2
Logical Link Control: Connecting to the Upper Layers
MAC: Getting Data to the Media
Physical Implementations of Ethernet
Ethernet: Communication Through the LAN
Historic Ethernet
Legacy Ethernet
Current Ethernet
Moving to 1 Gbps and Beyond
Ethernet Frame
Frame: Encapsulating the Packet
Ethernet MAC Address
Hexadecimal Numbering and Addressing
Another Layer of Addressing
Ethernet Unicast, Multicast, and Broadcast
Ethernet MAC
MAC in Ethernet
CSMA/CD: The Process
Ethernet Timing
Interframe Spacing and Backoff
Ethernet Physical Layer
10- and 100-Mbps Ethernet
1000-Mbps Ethernet
Ethernet: Future Options
Hubs and Switches
Legacy Ethernet: Using Hubs
Ethernet: Using Switches
Switches: Selective Forwarding
Address Resolution Protocol (ARP)
Resolving IPv4 Addresses to MAC Addresses
Maintaining a Cache of Mappings
ARP Broadcast Issues
Summary
Labs
Check Your Understanding
Challenge Questions and Activities
To Learn More
Planning and Cabling Networks
Objectives
Key Terms
LANs: Making the Physical Connection
Choosing the Appropriate LAN Device
Device Selection Factors
Device Interconnections
LAN and WAN: Getting Connected
Making LAN Connections
Making WAN Connections
Developing an Addressing Scheme
How Many Hosts in the Network?
How Many Networks?
Designing the Address Standard for Your Internetwork
Calculating the Subnets
Calculating Addresses: Case 1
Calculating Addresses: Case 2
Device Interconnections
Device Interfaces
Making the Device Management Connection
Summary
Labs
Check Your Understanding
Challenge Questions and Activities
To Learn More
Configuring and Testing Your Network
Objectives
Key Terms
Configuring Cisco Devices: IOS Basics
Cisco IOS
Access Methods
Configuration Files
Introducing Cisco IOS Modes
Basic IOS Command Structure
Using CLI Help
IOS Examination Commands
IOS Configuration Modes
Applying a Basic Configuration Using Cisco IOS
Naming Devices
Limiting Device Access: Configuring Passwords and Banners
Managing Configuration Files
Configuring Interfaces
Verifying Connectivity
Test the Stack
Testing the Interface
Testing the Local Network
Testing Gateway and Remote Connectivity
Tracing and Interpreting Trace Results
Monitoring and Documenting Networks
Basic Network Baselines
Capturing and Interpreting Trace Information
Learning About the Nodes on the Network
Summary
Labs
Check Your Understanding
Challenge Questions and Activities
To Learn More
Check Your Understanding and Challenge Questions Answer Key
Glossary
Index

Network Fundamentals, CCNA Exploration Companion Guide is the official supplemental textbook for the Network Fundamentals course in the Cisco Networking Academy CCNA Exploration curriculum version 4. The course, the first of four in the new curriculum, is based on a top-down approach to networking. The Companion Guide , written and edited by Networking Academy instructors, is designed as a portable desk reference to use anytime, anywhere. The books features reinforce the material in the course to help you focus on important concepts and organize your study time for exams. New and improved features help you study and succeed in this course: How ToLook for this icon to study the steps you need to learn to perform certain tasks. Packet Tracer Activities Explore networking concepts in activities interspersed throughout some chapters using Packet Tracer v4.1 developed by Cisco. The files for these activities are on the accompanying CD-ROM. Also available for the Network Fundamentals Course Network Fundamentals, CCNA Exploration Labs and Study Guide ISBN-10: 1-58713-203-6 ISBN-13: 978-1-58713-203-2 Companion CD-ROM The CD-ROM provides many useful tools and information to support your education: This book is part of the Cisco Networking Academy Series from Cisco Press. The products in this series support and complement the Cisco Networking Academy online curriculum.

This book is the official supplemental textbook for the Network Fundamentals course in the Cisco® Networking Academy® CCNA® Exploration curriculum version 4. The course, the first of four in the new curriculum, is based on a top-down approach to networking. The Companion Guide, written and edited by Networking Academy instructors, is designed as a portable desk reference to use anytime, anywhere. The book’s features reinforce the material in the course to help you focus on important concepts and organize your study time for exams.

本书主要内容包括:通信和网络的基本概念介绍, OSI和TCP/IP模型介绍, 应用层和传输层协议, 服务, IP寻址, 网络编址和路由基础, 数据链路层和物理层的介绍, 以太网技术及其原理, 网络设计和布线, Cisco路由器和交换机的基本配置. 每章的最后还提供了复习题, 附录中给出答案和解释

本书内容包括: 通信和网络的基本概念介绍, OSI和TCP/IP模型介绍, 应用层和传输层协议, 服务, IP寻址, 网络编址和路由基础, 数据链路层和物理层的介绍, 以太网技术及其原理, 网络设计和布线, Cisco路由器和交换机的基本配置

2022-03-17