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CCNA Security Official Exam Certification Guide
Michael Watkins
Kevin Wallace, CCIE No. 7945
Copyright© 2008 Cisco Systems, Inc.
Published by:
Cisco Press
800 East 96th Street
Indianapolis, IN 46240 USA
All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying, recording, or by any information storage and retrieval system, without written
permission from the publisher, except for the inclusion of brief quotations in a review.
Printed in the United States of America
First Printing June 2008
Library of Congress Cataloging-in-Publication data is on
ISBN-13: 978-1-58720-220-9
ISBN-10: 1-58720-220-4

Acknowledgments
From Michael Watkins:
I want to thank the team at Cisco Press for their direction and support throughout the
writing process. For their support and encouragement throughout this process, I wish to
thank and acknowledge Tom Warrick and the instructor team at SkillSoft. I also wish to
thank Kevin Wallace, who brought his talent and experience to this project and was an
enormous help each step of the way.
Finally, I want to thank my family for their continued support through this project,
especially my children, Abigail, Matthew, and Addison, who are always an inspiration in
all that I do.
From Kevin Wallace:
I wish to express my sincere thanks to the team at Cisco Press. You guys are a class act, and
I’m honored to be associated with you. Also, I give a huge thank-you to Michael Watkins
for inviting me to participate in writing this book.
On a personal note, I know all the good things in my life come from above, and I thank God
for those blessings. Also, my wife, Vivian, and my daughters, Sabrina and Stacie, have
become accustomed to seeing me attached to my laptop over the past few months. Thank
you for your love and support throughout this process.

Contents at a Glance
Foreword xxvi
Introduction xxvii
Part I Network Security Concepts 3
Chapter 1 Understanding Network Security Principles 5
Chapter 2 Developing a Secure Network 45
Chapter 3 Defending the Perimeter 77
Chapter 4 Configuring AAA 111
Chapter 5 Securing the Router 155
Part II Constructing a Secure Infrastructure 205
Chapter 6 Securing Layer 2 Devices 207
Chapter 7 Implementing Endpoint Security 251
Chapter 8 Providing SAN Security 279
Chapter 9 Exploring Secure Voice Solutions 297
Chapter 10 Using Cisco IOS Firewalls to Defend the Network 319
Chapter 11 Using Cisco IOS IPS to Secure the Network 385
Part III Extending Security and Availability with Cryptography and VPNs 427
Chapter 12 Designing a Cryptographic Solution 429
Chapter 13 Implementing Digital Signatures 463
Chapter 14 Exploring PKI and Asymmetric Encryption 491
Chapter 15 Building a Site-to-Site IPsec VPN Solution 523
Part IV Final Preparation 589
Chapter 16 Final Preparation 577
Part V Appendixes 583
Appendix A Answers to “Do I Know This Already?” Questions 585
Appendix B Glossary 595
Appendix C CCNA Security Exam Updates: Version 1.0 617
Appendix D Memory Tables (CD only)
Appendix E Memory Tables Answer Key (CD only)
Index 620