CCNA学习指南第七版：英文版初学者教程

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"CCNA 学习指南第七版英文[].pdf" 这本"CCNA 学习指南第七版"是一本专为网络初学者设计的教程，它详细介绍了Cisco Certified Network Associate（CCNA）认证所需的基础知识。本书分为多个章节，涵盖了网络互联、以太网、数据封装、TCP/IP协议族以及子网划分等多个关键领域。在第一章"Internetworking"中，作者讲解了网络互联的基本概念，包括互联网的工作原理以及网络模型。特别是OSI参考模型，这是一个七层的抽象模型，用于描述网络通信过程中的不同层次和功能。这一章还会帮助读者理解每个层次的作用，如物理层处理硬件连接，应用层则处理用户接口。第二章"Review of Ethernet Networking and Data Encapsulation"深入到以太网技术，回顾了以太网网络的结构和布线方式，同时介绍了数据封装的过程，即数据如何在不同的网络层之间进行转换和包装。此外，还介绍了Cisco的三层层次化模型，这是企业网络设计中常用的一种架构模式。第三章"Introduction to TCP/IP"引出了TCP/IP协议族，它是互联网的核心。书中详细解释了TCP/IP与DoD模型的关系，即网络层的IP协议如何实现不同网络间的通信。此外，章节中还涵盖了IP地址的基本知识，包括IPv4地址的不同类型。第四章"Easy Subnetting"则聚焦于子网划分，这是网络规划中的重要技能。基础的子网划分概念在这里被详述，帮助读者掌握如何通过子网掩码来有效地管理和分配IP地址。每一章末尾都有评估测试、书面实验室和复习问题，以检验学习效果并提供实践操作的机会。这些练习题的答案也一并包含在书中，便于自我检查和理解巩固。通过这本书，读者可以系统地学习到CCNA认证所需的理论知识，并通过实践环节提升动手能力，为成功通过CCNA考试打下坚实的基础。无论是对网络架构、TCP/IP协议还是子网划分感兴趣的初学者，都能从中受益匪浅。

Chapter 14 covers wireless technologies. This is an introductory chapter regarding wireless technologies as Cisco views wireless. However,

I also added some advanced wireless topics that cover Cisco’s newest gear. At this time, advanced wireless gear is not covered within the

Cisco CCNA objectives, but that can change. Make sure you understand basic wireless technologies like access points and clients as well

as the difference between 802.11a, b, and g.

Chapter 15 covers IPv6. This is a fun chapter and has some great information. IPv6 is not the big, bad scary monster that most people think it

is. IPv6 is an objective on the latest exam, so study this chapter carefully. Keep an eye out at www.lammle.com for late-breaking updates.

Chapter 16 concentrates on Cisco wide area network (WAN) protocols. This chapter covers HDLC, PPP, and Frame Relay in depth. VPNs

and IPSec are also covered in this chapter. You must be proficient in all these protocols to be successful on the CCNA exam. Do not skip the

written lab, review questions, or hands-on labs found in this chapter.

How to Use This Book

If you want a solid foundation for the serious effort of preparing for the Cisco Certified Network Associate (CCNA Composite) 640-802 exam, then

look no further. I have spent hundreds of hours putting together this book with the sole intention of helping you to pass the CCNA exam and learn

how to configure Cisco routers and switches.

This book is loaded with valuable information, and you will get the most out of your studying time if you understand how I put the book together.

To best benefit from this book, I recommend the following study method:

1. Take the assessment test immediately following this introduction. (The answers are at the end of the test.) It’s okay if you don’t know any

of the answers; that’s why you bought this book! Carefully read over the explanations for any question you get wrong and note the chapters

in which the material is covered. This information should help you plan your study strategy.

2. Study each chapter carefully, making sure you fully understand the information and the test objectives listed at the beginning of each

one. Pay extra-close attention to any chapter that includes material covered in questions you missed.

3. Complete the written labs at the end of each chapter. Do not skip these written exercises, because they directly relate to the CCNA

exam and what you must glean from the chapters in which they appear. Do not just skim these labs! Make sure you understand completely

the reason for each answer.

4. Complete all hands-on labs in the chapter, referring to the text of the chapter so that you understand the reason for each step you take.

Try to get your hands on some real equipment, but if you don’t have Cisco equipment available, try to find Cisco’s Packet Tracer for a

router simulator that you can use for all the hands-on labs needed for all your Cisco certification needs.

5. Answer all of the review questions related to each chapter. (The answers appear at the end of the chapters.) Note the questions that

confuse you and study the topics they cover again. Do not just skim these questions! Make sure you understand completely the reason for

each answer. Remember that these will not be the exact questions you find on the exam; they are written to help you understand the

chapter material.

6. Try your hand at the practice exams that are included on the companion CD. The questions in these exams appear only on the CD.

Check out www.lammle.com

for more Cisco exam prep questions.

7. Also on the companion CD is the first module from each of the first three CDs from my complete CCNA video series, which covers

internetworking, TCP/IP, and subnetting. This is critical information for the CCNA exam. In addition, as an added bonus, I have included

an audio section from my CCNA audio program. Do not skip the video and audio section!

Please understand that these are preview editions of the video and audios found at www.lammlepress.com and not the full versions, but are still a great value,

chock full of information.

8. Test yourself using all the flashcards on the CD. These are brand-new and updated flashcard programs to help you prepare for the

CCNA exam. They are a great study tool!

To learn every bit of the material covered in this book, you’ll have to apply yourself regularly, and with discipline. Try to set aside the same time

period every day to study, and select a comfortable and quiet place to do so. If you work hard, you will be surprised at how quickly you learn this

material.

If you follow these steps and really study—doing hands-on labs every single day—in addition to using the review questions, the practice exams,

the Todd Lammle video/audio sections, and the electronic flashcards, as well as all the written labs, it would be hard to fail the CCNA exam.

However, studying for the CCNA exam is like trying to get in shape—and if you do not go to the gym every day, you won’t get in shape.

What’s on the CD?

The folks at Sybex and I worked hard to provide some really great tools to help you with your certification process. All of the following tools should

be loaded on your workstation when you’re studying for the test. As a fantastic bonus, I was able to add to the CD included with this book a preview

section from both my CCNA video and audio series! Please understand that these are not the full versions, but they are still a great value for you

included free with this book.

The Sybex Test Preparation Software

The test preparation software prepares you to pass the CCNA exam. In the test engine, you will find all the review and assessment questions from

the book plus two practice exams with 140 questions that appear exclusively on the CD.

Electronic Flashcards

To prepare for the exam, you can read this book, study the review questions at the end of each chapter, and work through the practice exams

included in the book and on the companion CD. But wait, there’s more! You can also test yourself with the 200 flashcards included on the CD. If you

can get through these difficult questions and understand the answers, you’ll know you’re ready for the CCNA exam.

The CD includes 200 flashcards specifically written to hit you hard and make sure you are ready for the exam. With the review questions, practice

exams, and flashcards on the CD, you’ll be more than prepared for the exam.

Bonus Material

The bonus material, found only on the CD, has a wealth of information that covers SDM and CC, recognizing and mitigating security threats, route

authentication, layer-3 switching and switching types,and lastly, and probably the most valuable to you as a study tool, is the CCNA Simulation

Exam Practice Labs. Do not skip this bonus material when studying for the CCNA exam. Please see my web site and forum at www.lammle.com

for free up-to-the minute updates and new bonus material.

Todd Lammle Videos

I have created a full CCNA series of videos that can be purchased in either DVD or downloadable format from www.lammlepress.com. However,

as a bonus included with this book, the first module of this series is included on the CD as a “Preview.” Although this isn’t the full version, the video

is over 1 hour of foundational CCNA information. This is a $149 value! Do not skip this video because it covers the internetworking objectives,

TCP/IP, and subnetting, which are very important to the CCNA exam.

Todd Lammle Audio

In addition to the videos included for free on the CD, I have included a “preview” section from my CCNA audio series. The CCNA audio series is a

$199 value! This is a great tool to add to your arsenal of study material to help you pass the CCNA exam.

To find more Todd Lammle videos and audios as well as other Cisco study material, please see www.lammlepress.com.

Where Do You Take the Exams?

You may take the CCNA Composite exam at any of the Pearson VUE authorized testing centers (www.vue.com) or call 877-404-EXAM (3926).

To register for a Cisco Certified Network Associate exam, follow these steps:

1. Determine the number of the exam you want to take. (The CCNA exam number is 640-802.)

2. Register with the nearest Pearson VUE testing center. At this point, you will be asked to pay in advance for the exam. At the time of this

writing, the exam is $250 and must be taken within one year of payment. You can schedule exams up to six weeks in advance or as late

as the day you want to take it—but if you fail a Cisco exam, you must wait five days before you will be allowed to retake it. If something

comes up and you need to cancel or reschedule your exam appointment, contact Pearson VUE at least 24 hours in advance.

3. When you schedule the exam, you’ll get instructions regarding all appointment and cancellation procedures, the ID requirements, and

information about the testing-center location.

Tips for Taking Your CCNA Exam

The CCNA Composite exam test contains about 55 to 60 questions and must be completed in 75 to 90 minutes or less. This information can

change per exam. You must get a score of about 85 percent to pass this exam, but again, each exam can be different.

Many questions on the exam have answer choices that at first glance look identical—especially the syntax questions! Remember to read through

the choices carefully because close doesn’t cut it. If you get commands in the wrong order or forget one measly character, you’ll get the question

wrong. So, to practice, do the hands-on exercises at the end of this book’s chapters over and over again until they feel natural to you.

Also, never forget that the right answer is the Cisco answer. In many cases, more than one appropriate answer is presented, but the correct

answer is the one that Cisco recommends. On the exam, it always tells you to pick one, two, or three, never “choose all that apply.” The CCNA

Composite exam may include the following test formats:

Multiple-choice single answer

Multiple-choice multiple answer

Drag-and-drop

Fill-in-the-blank

Router simulations

Cisco proctored exams will not show the steps to follow in completing a router interface configuration; however, they do allow partial command

responses. For example, show config or sho config or sh conf would be acceptable. Router#show ip protocol or router#show ip prot would be acceptable.

Here are some general tips for exam success:

Arrive early at the exam center so you can relax and review your study materials.

Read the questions carefully. Don’t jump to conclusions. Make sure you’re clear about exactly what each question asks. Read twice, answer

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