Ccna: Cisco Certified Network Associate Study Guide, Seventh Edition (Includes Cd-Rom) snb txt 网盘 pdf kindle 2025 lit 下载

Learn from the Best - Cisco Networking Authority Todd Lammle

Written by Cisco networking authority Todd Lammle, this

comprehensive guide has been completely updated to reflect the

latest CCNA 640-802 exam. Todd’s straightforward style provides

lively examples, hands on and written labs, easy-to-understand

analogies, and real-world scenarios that will not only help you

prepare for the exam, but also give you a solid foundation as a

Cisco networking professional.

This Study Guide teaches you how to

Describe how a network works

Configure, verify and troubleshoot a switch with VLANs and

interswitch communications

Implement an IP addressing scheme and IP Services to meet

network requirements in a medium-size Enterprise branch office

network.

Configure, verify, and troubleshoot basic router operation and

routing on Cisco devices

Explain and select the appropriate administrative tasks

required for a WLAN

Identify security threats to a network and describe general

methods to mitigate those threats

Implement, verify, and troubleshoot NAT and ACLs in a

medium-size Enterprise branch office network.

Implement and verify WAN links

On the CD-ROM:

Chapter Review Questions

Full-Length Practice Exams

Electronic Flashcards

Exclusive CD-only bonus material, including the CCNA Simulation

Exam Practice Guide

All new Audio and Video Instruction from Todd Lammle

Note: CD-ROM/DVD and other supplementary materials are not

included as part of eBook file.

For Instructors: Teaching supplements are available for this

title.

Introduction xxiii

Assessment Test xxxii

Chapter 1 Internetworking 1

Chapter 2 Review of Ethernet Networking and Data Encapsulation

41

Chapter 3 Introduction to TCP/IP 83

Chapter 4 Easy Subnetting 135

Chapter 5 Variable Length Subnet Masks (VLSMs), Summarization,

and Troubleshooting TCP/IP 175

Chapter 6 Cisco’s Internetworking Operating System (IOS) 205

Chapter 7 Managing a Cisco Internetwork 277

Chapter 8 IP Routing 345

Chapter 9 Enhanced IGRP (EIGRP) and Open Shortest Path First

(OSPF) 427

Chapter 10 Layer 2 Switching and Spanning Tree Protocol (STP)

503

Chapter 11 Virtual LANs (VLANs) 557

Chapter 12 Security 607

Chapter 13 Network Address Translation (NAT) 655

Chapter 14 Cisco’s Wireless Technologies 683

Chapter 15 Internet Protocol Version 6 (IPv6) 715

Chapter 16 Wide Area Networks 741

Index 803

Todd Lammle, CCSI, CCNA/CCNA Wireless/CCNP/CCSP/CCVP, MCSE,

CEH/CHFI, FCC RF Licensed, is the authority on Cisco Certification

internetworking. He is a world-renowned author, speaker, trainer,

and consultant. Todd has over 29 years of experience working with

LANs, WANs, and large licensed and unlicensed wireless networks. He

has also published over 50 books, including the very popular Sybex

CCNA Study Guides and CCNA Wireless Study Guide. He runs a training

and consulting company based in Colorado and Texas. You can reach

Todd through his forum and blog at www.lammle.com.

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当路由器启动时,它要执行一系列的操作,即所谓的启动顺序(boot sequence),其目的是测试硬件并加载所需要的软件.启动顺序包括一下步骤:

(1) 路由器执行POST(开机自检).POST将检查硬件,以验证设备的所有组建目前是可运行的.例如, POST会分别检查路由器的不同接口.POST保存在ROM(只读存储器)中,并从ROM运行.

(2)之后,引导程序(Bootstrap loader)将查找路由器的不同接口. POST保存在ROM中,并从ROM运行.程序负责查找每个IOS程序的存储位置,并随后加载该文件.默认情况下,所有的思科路由器都会首先从闪存中加载IOS软件.(根据配置寄存器决定查找顺序)

注: 加载IOS的顺序是闪存,TFTP服务器,然后是ROM

(3) IOS软件将在NVRAM中查找有效的配置文件.此文件成为启动配置(startup-config), 只有当管理员将运行配置文件复制到NVRAM中时才会产生.(新的ISR路由器中都预设了一个小型启动配置文件.)

(4)如果在NVRAM中查找到启动配置文件,路由器则会复制此文件到RAM中,并将它称为运行配置,路由器将使用这个文件运行路由器.路由器将进入正常运转状态.如果在NVRAM中没有查找到配置启动文件,路由器将在所有可进行CD(carrier detect,载波检测)的接口发送广播,用以查找TFTP主机可使用的配置文件,如果没有找到(这一查找通常都不会成功,而大部分人甚至都不会察觉到路由器曾进行这样的尝试),路由器将进入设置模式进行配置.

该子网的广播地址为64

the FastEthernet interface is in the 32 subnet; the broadcast address is 63; and the valid hosts are 33–62.

On the top internetwork in Figure 1-4, you’ll notice that a bridge was used to connect the hubs to a router.

路由选择是指将分组从一个设备通过互连网络发往位于不同网络上的另一个设备的操作。路由器不关注网络中的主机，而只关注互联起来的网络以及通往各个网络的最佳路径。目标主机的逻辑网络地址用来获取通过可路由网络传送到指定网络中的分组，主机的硬件地址用来将分组从路由器投递到正确的目标主机上。

如果某个网络没有与路由器直接相连，那么路由器就必须通过这样两种方式了解如何到达这个远程网络：静态的路由选择，即必须由专人手工将所有的网络位置输入路由选择表；动态的路由选择，在动态路由选择的过程中，路由器上运行的协议将与相邻路由器上运行的同一协议进行通信。在此基础上，这些路由器可以不断更新各自对所有网络的了解，并且将相关的信息加入到路由选择表中。如果网络连接出现变化，这个动态路由选择协议就会将这个变化自动通知到所有的路由器。如果使用静态路由选择，管理员需要在所有的路由器上通过手动输入的方式更新所有的相关配置。在大型网络中，动态和静态路由选择通常会被同时使用。

书籍介绍

Learn from the Best - Cisco Networking Authority Todd Lammle Written by Cisco networking authority Todd Lammle, this comprehensive guide has been completely updated to reflect the latest CCNA 640-802 exam. Todd’s straightforward style provides lively examples, hands on and written labs, easy-to-understand analogies, and real-world scenarios that will not only help you prepare for the exam, but also give you a solid foundation as a Cisco networking professional. This Study Guide teaches you how to Describe how a network works Configure, verify and troubleshoot a switch with VLANs and interswitch communications Implement an IP addressing scheme and IP Services to meet network requirements in a medium-size Enterprise branch office network. Configure, verify, and troubleshoot basic router operation and routing on Cisco devices Explain and select the appropriate administrative tasks required for a WLAN Identify security threats to a network and describe general methods to mitigate those threats Implement, verify, and troubleshoot NAT and ACLs in a medium-size Enterprise branch office network. Implement and verify WAN links On the CD-ROM: Chapter Review Questions Full-Length Practice Exams Electronic Flashcards Exclusive CD-only bonus material, including the CCNA Simulation Exam Practice Guide All new Audio and Video Instruction from Todd Lammle Note: CD-ROM/DVD and other supplementary materials are not included as part of eBook file. For Instructors: Teaching supplements are available for this title.