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CompTIANetwork N10-005 AuthorizedEmmett DulaneyMike Harwood800 East 96th Street, Indianapolis, Indiana 46240 USA

CompTIA Network N10-005 Authorized Exam CramCopyright 2012 by PearsonAll rights reserved. No part of this book shall be reproduced, stored in aretrieval 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 thepreparation of this book, the publisher and author assume no responsibilityfor errors or omissions. Nor is any liability assumed for damages resultingfrom the use of the information contained herein.ISBN-13: 978-0-7897-4905-5ISBN-10: 0-7897-4905-XLibrary of Congress Cataloging-in-Publication data is on file.Second Printing: May 2012TrademarksAll terms mentioned in this book that are known to be trademarks or servicemarks have been appropriately capitalized. Pearson cannot attest to theaccuracy of this information. Use of a term in this book should not beregarded as affecting the validity of any trademark or service mark.Warning and DisclaimerPublisherPaul BogerAssociatePublisherDavid DusthimerAcquisitionsEditorBetsy BrownDevelopmentEditorBox TwelveCommunications,Inc.Managing EditorSandra SchroederProject EditorSeth KerneyEvery effort has been made to make this book as complete and as accurateas possible, but no warranty or fitness is implied. The information provided ison an “as is” basis. The author and the publisher shall have neither liabilitynor 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 ofthe CD or programs accompanying it.Copy EditorApostrophe EditingServicesBulk SalesProofreaderWilliams WoodsPublishing ServicesQue Publishing offers excellent discounts on this book when ordered inquantity for bulk purchases or special sales. For more information, pleasecontactU.S. Corporate and Government or sales outside of the U.S., please contactInternational Salesinternational@pearsoned.comIndexerKen JohnsonTechnical EditorChris CraytonPublishingCoordinatorVanessa EvansMultimediaDeveloperTim WarnerBook DesignerGary AdairPage LayoutBronkellaPublishing

Contents at a GlanceIntroduction1CHAPTER 1Introduction to Networking9CHAPTER 2OSI and TCP/IP Models and Network Protocols43CHAPTER 3Addressing and Routing93CHAPTER 4Components and Devices135CHAPTER 5Installation and Configuration167CHAPTER 6Cabling and Wiring209CHAPTER 7Wireless259CHAPTER 8Network Management303CHAPTER 9Network Optimization381CHAPTER 10Network Security413CHAPTER 11Network Troubleshooting475Practice Exam 1513Answers to Practice Exam 1537Practice Exam 2561Answers to Practice Exam 2585Glossary607Index649

Table of ContentsIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1About Network Exam Cram . . . . . . . . . . . . . . . . . . . . .About the Network Exam . . . . . . . . . . . . . . . . . . . . . .CompTIA Network Exam Topics . . . . . . . . . . . . .Booking and Taking the Network Certification ExamWhat to Expect from the Exam . . . . . . . . . . . . . . .A Few Exam Day Details . . . . . . . . . . . . . . . . . . . .After the Test . . . . . . . . . . . . . . . . . . . . . . . . . . .Last-Minute Exam Tips . . . . . . . . . . . . . . . . . . . .12245566CHAPTER 1:Introduction to Networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9LANs, WANs, and Network Models . . . . . . . . . . . . . . . . .LANs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .WANs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Network Models . . . . . . . . . . . . . . . . . . . . . . . . . .Centralized Computing versus Distributed Computing .Cram Quiz Answers . . . . . . . . . . . . . . . . . . . . . . . .Network Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bus Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ring Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . .Star Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . .Mesh Topology . . . . . . . . . . . . . . . . . . . . . . . . . . .Wireless Topologies . . . . . . . . . . . . . . . . . . . . . . . .Point-to-Point, Point-to-Multipoint, and Wireless MeshTopologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Hybrid Topologies . . . . . . . . . . . . . . . . . . . . . . . . .Cram Quiz Answers . . . . . . . . . . . . . . . . . . . . . . . .Going Virtual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Virtual Private Networks (VPNs) . . . . . . . . . . . . . . .Virtual Local Area Networks (VLANs) . . . . . . . . . . . .Cram Quiz Answers . . . . . . . . . . . . . . . . . . . . . . . .What Next? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101011121415161618192022.2427313232354041

CHAPTER 2:OSI and TCP/IP Models and Network Protocols . . . . . . . . . . . . . . . . . . . 43The Networking Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44The OSI Seven-Layer Model . . . . . . . . . . . . . . . . . . . . . . . . . 44The TCP/IP Four-Layer Model . . . . . . . . . . . . . . . . . . . . . . . 49Identifying the OSI Layers at Which Various NetworkComponents Operate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Cram Quiz Answers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53Connection-Oriented Protocols Versus Connectionless Protocols .54Internet Protocol (IP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Transmission Control Protocol (TCP) . . . . . . . . . . . . . . . . . . . 55User Datagram Protocol (UDP) . . . . . . . . . . . . . . . . . . . . . . . 56File Transfer Protocol (FTP) . . . . . . . . . . . . . . . . . . . . . . . . . 57Secure File Transfer Protocol (SFTP). . . . . . . . . . . . . . . . . . . . 58Trivial File Transfer Protocol (TFTP) . . . . . . . . . . . . . . . . . . . 59Simple Mail Transfer Protocol (SMTP) . . . . . . . . . . . . . . . . . . 59Hypertext Transfer Protocol (HTTP) . . . . . . . . . . . . . . . . . . . 60Hypertext Transfer Protocol Secure (HTTPS) . . . . . . . . . . . . . . 60Post Office Protocol Version 3/Internet Message Access ProtocolVersion 4 (POP3/IMAP4) . . . . . . . . . . . . . . . . . . . . . . . . . . 61Telnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62Secure Shell (SSH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62Internet Control Message Protocol (ICMP) . . . . . . . . . . . . . . . . 63Address Resolution Protocol (ARP)/Reverse Address ResolutionProtocol (RARP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63Network Time Protocol (NTP) . . . . . . . . . . . . . . . . . . . . . . . 65Network News Transfer Protocol (NNTP) . . . . . . . . . . . . . . . . 66Secure Copy Protocol (SCP) . . . . . . . . . . . . . . . . . . . . . . . . . 66Lightweight Directory Access Protocol (LDAP) . . . . . . . . . . . . . 66Internet Group Management Protocol (IGMP) . . . . . . . . . . . . . 67Transport Layer Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67Session Initiation Protocol (SIP)/Real-Time TransportProtocol (RTP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68TCP/IP Protocol Suite Summary . . . . . . . . . . . . . . . . . . . . . . 69Cram Quiz Answers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73Domain Name Service (DNS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74The DNS Namespace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76Types of DNS Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78DNS Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

viCompTIA Network N10-005 Authorized Exam CramDNS in a Practical Implementation . . . . .Cram Quiz Answers . . . . . . . . . . . . . . .Simple Network Management Protocol (SNMP)Components of SNMP . . . . . . . . . . . . .SNMP Management Systems . . . . . . . . .SNMP Agents . . . . . . . . . . . . . . . . . . .Management Information Bases (MIBs) . .SNMP Communities . . . . . . . . . . . . . .SNMPv3 . . . . . . . . . . . . . . . . . . . . . .Cram Quiz Answers . . . . . . . . . . . . . . .Dynamic Host Configuration Protocol (DHCP)The DHCP Process . . . . . . . . . . . . . . .DHCP and DNS Suffixes . . . . . . . . . . .Cram Quiz Answers . . . . . . . . . . . . . . .What Next? . . . . . . . . . . . . . . . . . . . . . . . .798182838384858586878889909192CHAPTER 3:Addressing and Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93IP Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94IPv4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95IP Address Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95Subnet Mask Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96Subnetting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97Identifying the Differences Between IPv4 Public and PrivateNetworks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98Classless Interdomain Routing (CIDR) . . . . . . . . . . . . . . . . . . 100Default Gateways . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100IPv4 Address Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102IPv6 Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102Comparing IPv4 and IPv6 Addressing . . . . . . . . . . . . . . . . . . . 106Assigning IP Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107Identifying MAC Addresses . . . . . . . . . . . . . . . . . . . . . . . . . 110Network Address Translation (NAT) and Port AddressTranslation (PAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112Cram Quiz Answers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116Understanding TCP/UDP Port Functions . . . . . . . . . . . . . . . . . . . 117Cram Quiz Answers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119Managing TCP/IP Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120The Default Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120Routing Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121