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  • CompTIA® Network+

    N10-006

    Emmett Dulaney

    800 East 96th Street Indianapolis, Indiana 46240 USA

  • CompTIA® Network+ N10-006 Exam Cram, Fifth Edition Copyright © 2015 by Pearson Education, Inc. All rights reserved. No part of this book shall be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without written permission from the publisher. No patent liability is assumed with respect to the use of the information contained herein. Although every precaution has been taken in the preparation of this book, the publisher and author assume no responsibility for errors or omissions. Nor is any liability assumed for damages resulting from the use of the information contained herein. ISBN-13: 978-0-7897-5410-3 ISBN-10: 0-7897-5410-X Library of Congress Control Number: 2015934591 Printed in the United States of America Second Printing: September 2015

    Trademarks All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capitalized. Que Publishing cannot attest to the accuracy of this information. Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark.

    Warning and Disclaimer Every effort has been made to make this book as complete and as accurate as possible, but no warranty or fitness is implied. The information provided is on an “as is” basis. The author and the publisher shall have neither liability nor responsibility to any person or entity with respect to any loss or damages arising from the information contained in this book or from the use of the CD or programs accompanying it.

    Special Sales For information about buying this title in bulk quantities, or for special sales opportunities (which may include electronic versions; custom cover designs; and content particular to your business, training goals, marketing focus, or branding interests), please contact our corporate sales department at corpsales@pearsoned.com or (800) 382-3419. For government sales inquiries, please contact governmentsales@pearsoned.com. For questions about sales outside the U.S., please contact international@pearsoned.com.

    Editor-in-Chief Dave Dusthimer

    Acquisitions Editor Betsy Brown

    Development Editor Jeff Riley

    Managing Editor Sandra Schroeder

    Senior Project Editor Tonya Simpson

    Copy Editor Keith Cline

    Indexer Johnna VanHoose Dinse

    Proofreader Paula Lowell

    Technical Editor Christopher A. Crayton

    Editorial Assistant Vanessa Evans

    Media Producer Lisa Matthews

    Cover Designer Alan Clements

    Compositor Mary Sudul

  • Contents at a Glance Introduction 1

    CHAPTER 1 Introduction to Networking 9

    CHAPTER 2 The OSI Model and Networking Protocols 41

    CHAPTER 3 Addressing and Routing 93

    CHAPTER 4 Components and Devices 135

    CHAPTER 5 Cloud Computing Basics 161

    CHAPTER 6 Installation and Configuration 173

    CHAPTER 7 Cabling and Wiring 219

    CHAPTER 8 Wireless 279

    CHAPTER 9 Network Management 325

    CHAPTER 10 Network Optimization 367

    CHAPTER 11 Network Security 383

    CHAPTER 12 Network Troubleshooting 471

    Glossary 555

    Index 603

    On the CD:

    Practice Exam 1

    Answers to Practice Exam 1

    Practice Exam 2

    Answers to Practice Exam 2

  • Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

    CHAPTER 1 Introduction to Networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

    LANs, WANs, MANs, SCADA/ICS, Medianets, and Network Models . 10

    LANs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

    WANs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

    MANs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

    SCADA/ICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

    Medianets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

    Network Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

    Centralized Versus Distributed Computing . . . . . . . . . . . . . . . . 15

    Network Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

    Bus Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

    Ring Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

    Star Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

    Wired Mesh Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

    Wireless Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Point-to-Point, Point-to-Multipoint, and Wireless Mesh

    Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

    Hybrid Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

    Creating a SOHO Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

    What’s Next? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

    CHAPTER 2 The OSI Model and Networking Protocols . . . . . . . . . . . . . . . . . . . . . . . . 41

    The Networking Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

    The OSI Seven-Layer Model . . . . . . . . . . . . . . . . . . . . . . . . . . 42

    The TCP/IP Four-Layer Model . . . . . . . . . . . . . . . . . . . . . . . 48 Identifying the OSI Layers at Which Various Network

    Components Operate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

    Dynamic Host Configuration Protocol (DHCP) . . . . . . . . . . . . . . . . . 51

    The DHCP Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

    DHCP and DNS Suffixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

    DHCP Relays and IP Helpers . . . . . . . . . . . . . . . . . . . . . . . . . 54

  • Domain Name Service (DNS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

    The DNS Namespace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

    Types of DNS Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

    DNS Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

    DNS in a Practical Implementation . . . . . . . . . . . . . . . . . . . . . 62

    Simple Network Management Protocol (SNMP) . . . . . . . . . . . . . . . . 65

    Components of SNMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

    SNMP Management Systems . . . . . . . . . . . . . . . . . . . . . . . . . . 66

    SNMP Agents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

    Management Information Bases . . . . . . . . . . . . . . . . . . . . . . . 67

    SNMP Communities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

    SNMPv3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

    Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Connection-Oriented Protocols Versus Connectionless

    Protocols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

    Internet Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

    Transmission Control Protocol . . . . . . . . . . . . . . . . . . . . . . . . 73

    User Datagram Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

    File Transfer Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

    Secure File Transfer Protocol . . . . . . . . . . . . . . . . . . . . . . . . . 76

    Trivial File Transfer Protocol . . . . . . . . . . . . . . . . . . . . . . . . . 77

    Simple Mail Transfer Protocol . . . . . . . . . . . . . . . . . . . . . . . . 78

    Hypertext Transfer Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . 78

    Hypertext Transfer Protocol Secure . . . . . . . . . . . . . . . . . . . . . 79 Post Office Protocol Version 3/Internet Message Access Protocol

    Version 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

    Telnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

    Secure Shell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

    Internet Control Message Protocol . . . . . . . . . . . . . . . . . . . . . 81 Address Resolution Protocol/Reverse Address Resolution

    Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

    Network Time Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

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