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advance praise todd s methods of discussing topics are tactfully approached so they are not confusing to the reader and his explanations are clear and easy to understand amazon reader review i passed my ccna on the first try after reading this book thoroughly if you read the book and do all the review questions and written labs at the end of each chapter you will be well prepared for the exam amazon reader review this is a great book todd lammle has the ability to make complex topics simple cisco books are essential once you ve mastered networking basics but there is nothing like sybex for learning the concepts from a to z amazon reader review todd has been an authority in this field for as long as i can remember his style of writing keeps the book from becoming a sleep aid and provides nuts and bolts information that is both excellent real-world reference and directly relevant to exam objectives if you are considering taking the ccna exam you would be ill advised to not give this book a thorough read amazon reader review this is the first book review i have ever written on amazon i ve been in the computer/network support field for many years but had almost no contact with cisco equipment i basically knew the `enable and `config cisco commands i had originally planned on shelling out the $3000 to take a ccna boot camp but decided that that was way too much money so i bought this book instead took a week off from work which i would have done anyway for the class and went at it my homegrown boot camp paid off because i passed the exam on the first try saving almost $2900 amazon reader review this is the best technical book i have ever read amazon reader review this book is excellent resource for preparation for ccna certification it has needed information regarding the cisco s objective sample test and bonus test give extra knowledge for exam s question users have more knowledge and practice of test exams i will recommend this book for anyone who does not have any knowledge of ccna material amazon reader review

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i ve recently passed the ccna exam with 985 out of 1000 points and todd lammle s book was my only study material along with a cisco 2500 router it covers all relevant topics in such an easy-to-understand way and gives you a great networking/cisco knowledge to build upon even now while i m pursuing other certifications it serves as an irreplaceable reference every chapter concludes with review questions hands-on exercises or labs to give you the opportunity of applying your new skills in realworld scenarios and the cd provides additional sample tests and flashcards to consolidate your knowledge by reading the book twice and doing all the exercises you will be able to answer just about any question you may encounter on the exam highly recommended amazon reader review i had made three previous attempts using cisco press but could not get over the hump needless to say i was getting pretty discouraged however i had heard good things about the sybex book by todd lammle and decided to give it a try it was the best thing i could have done the book read great and it explained the required concepts and topics very well the review questions and hand-on labs at the end of each chapter were also very helpful i took the test last weekend and passed thank you amazon reader review good exam prep i read this book and with only slight network experience was able to pass the ccna amazon reader review there isn t much more i can say about this book than has already been said i used todd s guide to help me pass the ccna in 2000 and am using him again to recertify just an excellent book period amazon reader review this book covered everything i needed to pass the exam with hands-on experience and the bonus material what a great written book this is the best i have ever read i recommend this book highly amazon reader review

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ccna ® cisco® certified network associate study guide sixth edition todd lammle wiley publishing inc.

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acquisitions editor jeff kellum development editor toni zuccarini ackley technical editor patrick j conlan production editor sarah groff-palermo copy editor judy flynn production manager tim tate vice president and executive group publisher richard swadley vice president and executive publisher joseph b wikert vice president and publisher neil edde media project supervisor laura atkinson media development specialist josh frank media quality assurance angie denny book designers judy fung and bill gibson compositor craig woods happenstance type-o-rama proofreader nancy riddiough indexer ted laux anniversary logo design richard pacifico cover designer ryan sneed copyright © 2007 by wiley publishing inc indianapolis indiana published simultaneously in canada isbn 978-0-470-11008-9 no part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording scanning or otherwise except as permitted under sections 107 or 108 of the 1976 united states copyright act without either the prior written permission of the publisher or authorization through payment of the appropriate per-copy fee to the copyright clearance center 222 rosewood drive danvers ma 01923 978 750-8400 fax 978 646-8600 requests to the publisher for permission should be addressed to the legal department wiley publishing inc 10475 crosspoint blvd indianapolis in 46256 317 572-3447 fax 317 572-4355 or online at http www.wiley.com/go/permissions limit of liability/disclaimer of warranty the publisher and the author make no representations or warranties with respect to the accuracy or completeness of the contents of this work and specifically disclaim all warranties including without limitation warranties of fitness for a particular purpose no warranty may be created or extended by sales or promotional materials the advice and strategies contained herein may not be suitable for every situation this work is sold with the understanding that the publisher is not engaged in rendering legal accounting or other professional services if professional assistance is required the services of a competent professional person should be sought neither the publisher nor the author shall be liable for damages arising herefrom the fact that an organization or website is referred to in this work as a citation and/or a potential source of further information does not mean that the author or the publisher endorses the information the organization or website may provide or recommendations it may make further readers should be aware that internet websites listed in this work may have changed or disappeared between when this work was written and when it is read for general information on our other products and services or to obtain technical support please contact our customer care department within the u.s at 800 762-2974 outside the u.s at 317 572-3993 or fax 317 572-4002 wiley also publishes its books in a variety of electronic formats some content that appears in print may not be available in electronic books library of congress cataloging-in-publication data is available from the publisher trademarks wiley the wiley logo and the sybex logo are trademarks or registered trademarks of john wiley sons inc and/or its affiliates in the united states and other countries and may not be used without written permission cisco and ccna are registered trademarks of cisco systems inc all other trademarks are the property of their respective owners wiley publishing inc is not associated with any product or vendor mentioned in this book 10 9 8 7 6 5 4 3 2 1

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to our valued readers thank you for looking to sybex for your ccna exam prep needs we at sybex are proud of our reputation for providing certification candidates with the practical knowledge and skills needed to succeed in the highly competitive it marketplace this latest edition of the best-selling ccna cisco certified network associate study guide reflects our commitment to provide ccna candidates with the most up-to-date accurate and accessible instructional material on the market as with previous editions todd and the editors have worked hard to ensure that the study guide you hold in your hands is comprehensive in-depth and pedagogically sound we re confident that this book will exceed the demanding standards of the certification marketplace and help you the ccna certification candidate succeed in your endeavors as always your feedback is important to us if you believe you ve identified an error in the book please visit the customer support section of the wiley website and if you have general comments or suggestions feel free to drop me a line directly at nedde@wiley.com at sybex we re continually striving to meet the needs of individuals preparing for certification exams good luck in pursuit of your ccna certification neil edde publisher certification sybex an imprint of wiley

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acknowledgments monica lammle s writing style and voice editing ability encouragement and dedication to ensuring that my books are concise yet highly readable has been invaluable to the success of this and many other projects she brings clarity and life to what can truly be some very arcane and difficult material mr patrick conlan has got to be the personification of perseverance he s a rock patrick literally hashed and rehashed each topic in this guide with me at all hours of the day and night scrutinizing the material until we both agreed it was verifiably solid he was so instrumental in the development of this book that i hired him at globalnet training to work as a course developer and trainer you re going to be hearing a lot more from mr conlan in the technical instruction and writing arena in the future for sure daniel aguilera who has worked with me at globalnet training for seven years also worked diligently helping me put together the bonus exams you ll find on the cd so be sure to give him a call if you happen to find a problem

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contents at a glance introduction assessment test chapter 1 chapter 2 chapter 3 chapter 4 chapter 5 chapter 6 chapter 7 chapter 8 chapter 9 chapter 10 chapter 11 chapter 12 chapter 13 chapter 14 glossary index internetworking introduction to tcp/ip subnetting variable length subnet masks vlsms and troubleshooting tcp/ip cisco s internetworking operating system ios and security device manager sdm managing a cisco internetwork ip routing enhanced igrp eigrp and open shortest path first ospf layer 2 switching and spanning tree protocol stp virtual lans vlans security network address translation nat cisco s wireless technologies internet protocol version 6 ipv6 wide area networks xxiii xxxiii 1 67 111 171 251 327 417 493 551 609 669 703 739 773 851 911

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table of contents introduction assessment test chapter 1 internetworking internetworking basics internetworking models the layered approach advantages of reference models the osi reference model the application layer the presentation layer the session layer the transport layer the network layer the data link layer the physical layer ethernet networking half and full-duplex ethernet ethernet at the data link layer ethernet at the physical layer ethernet cabling straight-through cable crossover cable rolled cable data encapsulation the cisco three-layer hierarchical model the core layer the distribution layer the access layer summary exam essentials written lab 1 written lab 1.1 osi questions written lab 1.2 defining the osi layers and devices written lab 1.3 identifying collision and broadcast domains written lab 1.4 binary/decimal/hexadecimal conversion review questions answers to review questions xxiii xxxiii 1 4 11 12 12 13 15 16 16 16 22 24 30 31 33 34 37 39 39 40 40 43 46 47 48 49 49 49 50 51 52 53 53 56 60

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xii table of contents answers to written lab 1 answer to written lab 1.2 answers to written lab 1.3 answers to written lab 1.4 chapter 2 introduction to tcp/ip tcp/ip and the dod model the process/application layer protocols the host-to-host layer protocols the internet layer protocols ip addressing ip terminology the hierarchical ip addressing scheme private ip addresses broadcast addresses summary exam essentials written lab 2 review questions answers to review questions answers to written lab 2 chapter 3 subnetting variable length subnet masks vlsms and troubleshooting tcp/ip subnetting basics ip subnet-zero how to create subnets subnet masks classless inter-domain routing cidr subnetting class c addresses subnetting class b addresses subnetting class a addresses variable length subnet masks vlsms vlsm design implementing vlsm networks summarization troubleshooting ip addressing determining ip address problems summary exam essentials written labs 3 written lab 3.1 written subnet practice #1 written lab 3.2 written subnet practice written lab 3.3 written subnet practice 62 63 63 64 67 68 70 74 83 92 93 93 98 100 101 102 102 104 108 110 111 112 113 114 115 116 118 127 134 137 138 139 147 150 153 157 158 158 159 159 160

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table of contents xiii review questions answers to review questions answers to written lab 3.1 answers to written lab 3.2 answers to written lab 3.3 chapter 4 cisco s internetworking operating system ios and security device manager sdm the ios user interface cisco router ios connecting to a cisco router bringing up a router command-line interface cli entering the cli from a non-isr router overview of router modes cli prompts editing and help features gathering basic routing information router and switch administrative configurations hostnames banners setting passwords encrypting your passwords descriptions router interfaces bringing up an interface viewing saving and erasing configurations deleting the configuration and reloading the router verifying your configuration cisco s security device manager sdm summary exam essentials written lab 4 hands-on labs hands-on lab 4.1 logging into a router hands-on lab 4.2 using the help and editing features hands-on lab 4.3 saving a router configuration hands-on lab 4.4 setting your passwords hands-on lab 4.5 setting the hostname descriptions ip address and clock rate hands-on lab 4.6 installing sdm on your computer review questions answers to review questions answers to written lab 4 161 166 168 169 169 171 173 173 173 175 179 180 181 182 185 189 191 191 192 194 199 201 204 206 212 214 214 223 232 233 234 235 235 236 237 237 239 241 242 247 249

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xiv table of contents chapter 5 managing a cisco internetwork the internal components of a cisco router the router boot sequence managing configuration register understanding the configuration register bits checking the current configuration register value changing the configuration register recovering passwords boot system commands backing up and restoring the cisco ios verifying flash memory backing up the cisco ios restoring or upgrading the cisco router ios using the cisco ios file system cisco ifs using the sdm to manage the flash memory backing up and restoring the cisco configuration backing up the cisco router configuration restoring the cisco router configuration erasing the configuration using the cisco ios file system to manage your router s configuration cisco ifs using the sdm to back up/restore and edit the router s configuration using cisco discovery protocol cdp getting cdp timers and holdtime information gathering neighbor information gathering interface traffic information gathering port and interface information documenting a network topology using cdp using telnet telnetting into multiple devices simultaneously checking telnet connections checking telnet users closing telnet sessions using sdm to telnet into your router resolving hostnames building a host table using dns to resolve names checking network connectivity and troubleshooting using the ping command using the traceroute command debugging using the show processes command summary 251 252 253 254 254 256 256 258 261 262 263 264 265 266 270 274 275 276 277 278 280 283 283 284 289 290 292 295 297 297 297 298 299 300 300 302 305 305 307 308 310 311

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