Table of Contents

CompTIA Discount Coupon

Cover

Title Page

Copyright

Publisher's Note

Acknowledgments

About the Author

Foreword

Introduction

Assessment Test

Answers to Assessment Test

Chapter 1: Introduction to Networks

First Things First: What’s a Network?

Physical Network Topologies

Topology Selection, Backbones, and Segments

Summary

Exam Essentials

Written Labs

Review Questions

Chapter 2: The Open Systems Interconnection Specifications

Internetworking Models

The OSI Reference Model

Introduction to Encapsulation

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 3: Networking Topologies, Connectors, and Wiring Standards

Physical Media

Cable Properties

Wiring Standards

Installing Wiring Distributions

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 4: The Current Ethernet Specifications

Network Basics

Ethernet Basics

Ethernet at the Data Link Layer

Ethernet at the Physical Layer

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 5: Networking Devices

Common Network Connectivity Devices

Other Specialized Devices

Planning and Implementing a Basic SOHO Network Using Network Segmentation

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 6: Introduction to the Internet Protocol

Introducing TCP/IP

Data Encapsulation

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 7: IP Addressing

IP Terminology

The Hierarchical IP Addressing Scheme

IPv4 Address Types

Internet Protocol Version 6 (IPv6)

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 8: IP Subnetting, Troubleshooting IP, and Introduction to NAT

Subnetting Basics

Troubleshooting IP Addressing

Introduction to Network Address Translation (NAT)

Summary

Exam Essentials

Written Labs

Review Questions

Chapter 9: Introduction to IP Routing

Routing Basics

The IP Routing Process

Testing Your IP Routing Understanding

Static and Dynamic Routing

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 10: Routing Protocols

Routing Protocol Basics

Distance Vector Routing Protocols

Link State Routing Protocols

IPv6 Routing Protocols

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 11: Switching and Virtual LANs

Networking Before Layer 2 Switching

Switching Services

Spanning Tree Protocol

Virtual LANs

VLAN Trunking Protocol

Two Additional Advanced Features of Switches

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 12: Wireless Networking

Introduction to Wireless Technology

The 802.11 Standards

Comparing 802.11 Standards

Wireless Network Components

Installing a Wireless Network

Wireless Security

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 13: Authentication and Access Control

Security Filtering

Managing User Account and Password Security

User-Authentication Methods

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 14: Network Threats and Mitigation

Recognizing Security Threats

Understanding Mitigation Techniques

Policies and Procedures

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 15: Physical and Hardware Security

Using Hardware and Software Security Devices

Defining Firewalls

Firewall Technologies

Firewalls at the Application Layer vs. the Network Layer

Scanning Services and Other Firewall Features

Intrusion Detection and Prevention Systems

VPN Concentrators

Understanding Problems Affecting Device Security

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 16: Wide Area Networks

What’s a WAN?

T-Series Connections

Transmission Media

Broadband Services

Wireless WAN Technologies

WAN Protocols

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 17: Troubleshooting Tools

Protocol Analyzers

Throughput Testers

Connectivity Software

Using Traceroute

Using ipconfig and ifconfig

Using the ping Utility

Using the Address Resolution Protocol

Using the nslookup Utility

Resolving Names with the Hosts Table

Using the Mtr Command

Using the route Command

Using the nbtstat Utility

Using the netstat Utility

Using the File Transfer Protocol

Using the Telnet Utility

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 18: Software and Hardware Tools

Understanding Network Scanners

Identifying Hardware Tools

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 19: Network Troubleshooting

Narrowing Down the Problem

Troubleshooting Steps

Troubleshooting Tips

Summary

Exam Essentials

Written Lab

Review Questions

Chapter 20: Management, Monitoring, and Optimization

Managing Network Documentation

Monitoring the Network and Optimizing Its Performance

Summary

Exam Essentials

Written Lab

Review Questions

Appendix A: Answers to Review Questions

Chapter 1: Introduction to Networks

Chapter 2: The Open Systems Interconnection Specifications

Chapter 3: Networking Topologies, Connectors, and Wiring Standards

Chapter 4: The Current Ethernet Specifications

Chapter 5: Networking Devices

Chapter 6: Introduction to the Internet Protocol

Chapter 7: IP Addressing

Chapter 8: IP Subnetting, Troubleshooting IP, and Introduction to NAT

Chapter 9: Introduction to IP Routing

Chapter 10: Routing Protocols

Chapter 11: Switching and Virtual LANs

Chapter 12: Wireless Networking

Chapter 13: Authentication and Access Control

Chapter 14: Network Threats and Mitigation

Chapter 15: Physical and Hardware Security

Chapter 16: Wide Area Networks

Chapter 17: Troubleshooting Tools

Chapter 18: Software and Hardware Tools

Chapter 19: Network Troubleshooting

Chapter 20: Management, Monitoring, and Optimization

Appendix B: Answers to Written Labs

Chapter 1: Introduction to Networks

Chapter 2: The Open Systems Interconnection Specifications

Chapter 3: Networking Topologies, Connectors, and Wiring Standards

Chapter 4: The Current Ethernet Specifications

Chapter 5: Networking Devices

Chapter 6: Introduction to the Internet Protocol

Chapter 7: IP Addressing

Chapter 8: IP Subnetting, Troubleshooting IP, and Introduction to NAT

Chapter 9: Introduction to IP Routing

Chapter 10: Routing Protocols

Chapter 11: Switching and Virtual LANs

Chapter 12: Wireless Networking

Chapter 13: Authentication and Access Control

Chapter 14: Network Threats and Mitigation

Chapter 15: Physical and Hardware Security

Chapter 16: Wide Area Networks

Chapter 17: Troubleshooting Tools

Chapter 18: Software and Hardware Tools

Chapter 19: Network Troubleshooting

Chapter 20: Management, Monitoring, and Optimization

Appendix C: Subnetting Class A

Subnetting Practice Examples: Class A Addresses

Subnetting in Your Head: Class A Addresses

Written Lab 1

Written Lab 2

Answers to Written Lab 1

Answers to Written Lab 2

Appendix D: About the Additional Study Tools

Additional Study Tools

System Requirements

Using the Study Tools

Troubleshooting

Index

Back Insert

Exam Objectives Map

Senior Acquisitions Editor: Jeff Kellum

Development Editor: Kim Wimpsett

Technical Editors: Troy McMillan and Tom Carpenter

Production Editor: Christine O’Connor

Copy Editor: Judy Flynn

Editorial Manager: Pete Gaughan

Production Manager: Tim Tate

Vice President and Executive Group Publisher: Richard Swadley

Vice President and Publisher: Neil Edde

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Book Designers: Judy Fung and Bill Gibson

Compositor: Craig Woods, Happenstance Type-O-Rama

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Indexer: Robert Swanson

Project Coordinator, Cover: Katherine Crocker

Cover Designer: Ryan Sneed

Copyright © 2012 by John Wiley & Sons, Inc., Indianapolis, Indiana

Published simultaneously in Canada

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Dear Reader,

Thank you for choosing CompTIA Network+ Study Guide, Second Edition. This book is part of a family of premium-quality Sybex books, all of which are written by outstanding authors who combine practical experience with a gift for teaching.

Sybex was founded in 1976. More than 30 years later, we’re still committed to producing consistently exceptional books. With each of our titles, we’re working hard to set a new standard for the industry. From the paper we print on, to the authors we work with, our goal is to bring you the best books available.

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Acknowledgments

Kim Wimpsett was the development editor of this, the newest book in the Sybex CompTIA series. Thank you, Kim, for working so hard on this book with me.

Jeff Kellum is instrumental to my success in the Cisco world and is my acquisitions editor for this new CompTIA Network+ book. Jeff, thanks for your guidance and continued patience with all the books we’ve published together!

In addition, Christine O’Connor was an excellent production editor, and she worked really hard to get the book done as quickly as possible, without missing the small mistakes that are so easy to overlook. I am always very pleased when I hear that she will be working with me on a new project. Judy Flynn was my copy editor, and she was patient, helpful, and detailed but yet worked extremely hard to get this book on the shelf as quickly as possible, and for that I thank her tremendously.

Troy McMillian 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. Thank you, Troy, yet once again!

About the Author

Todd Lammle, CompTIA Network+, CCSI, CCNA/CCNP, CCSP/CCVP, MCSE, CEH/CHFI, FCC RF Licensed, is the authority on network certification and internetworking. He is a world-renowned author, speaker, trainer, and consultant. Todd has over 25 years of experience working with LANs, WANs, and large licensed and unlicensed wireless networks. He’s president and CEO of GlobalNet Training and Consulting, Inc., a network-integration and training firm based in Boulder, Colorado; Dallas, Texas; and San Francisco, California. You can reach Todd through his forum at www.lammle.com/forum.

Foreword

CompTIA Network+:

The CompTIA Network+ (2011 Edition) certification ensures that the successful candidate has the important knowledge and skills necessary to manage, maintain, troubleshoot, install, operate, and configure basic network infrastructure; describe networking technologies and basic design principles; adhere to wiring standards; and use testing tools.

It Pays to Get Certified

In a digital world, digital literacy is an essential survival skill. Certification proves you have the knowledge and skill to solve business problems in virtually any business environment.

CompTIA Network+ certification is held by many IT Staff in organizations. 21% of IT staff within a random sampling of U.S. organizations within a cross section of industry verticals hold Network+ certification.

The CompTIA Network+ credential Proves knowledge of networking features and functions and is the leading vendor-neutral certification for networking professionals.

Starting Salary The average starting salary of network engineers can be up to $70,000.

Career Pathway CompTIA Network+ is the first step in starting a networking career and is recognized by Microsoft as part of their MS program. Other corporations, such as Novell, Cisco, and HP also recognize CompTIA Network+ as part of their certification tracks.

More than 260,000 Individuals worldwide are CompTIA Network+ certified.

Mandated/Recommended by organizations worldwide Such as Cisco, HP, Ricoh, the U.S. State Department, and U.S. government contractors such as EDS, General Dynamics, and Northrop Grumman.

How Certification Helps Your Career

CompTIA Career Pathway

CompTIA offers a number of credentials that form a foundation for your career in technology and allow you to pursue specific areas of concentration. Depending on the path you choose to take, CompTIA certifications help you build upon your skills and knowledge, supporting learning throughout your entire career.

Steps to Getting Certified

Review exam objectives. Review the certification objectives to make sure you know what is covered in the exam.

www.comptia.org/certifications/testprep/practicetests.aspx

Practice for the exam. After you have studied for the certification, take a free assessment and sample test to get an idea of what type of questions might be on the exam.

certification.comptia.org/Training/testingcenters/examobjectives.aspx

Purchase an exam voucher. Purchase your exam voucher on the CompTIA Marketplace, which is located at www.comptiastore.com.

Take the test! Select a certification exam provider and schedule a time to take your exam. You can find exam providers at the following link:

certification.comptia.org/Training/testingcenters/

Stay certified through continuing Education! Effective January 1, 2011, new CompTIA Security+ certifications are valid for three years from the date of your certification. There are a number of ways the certification can be renewed. For more information go to

http://certification.comptia.org/getCertified/steps_to_certification/stayCertified.aspx

Join the IT Professional Community

The free IT Pro online community at http://itpro.comptia.org provides valuable content to students and professionals.

Career IT job resources

Where to start in IT

Career assessments

Salary trends

US job board

Forums on networking, security, computing, and cutting-edge technologies

Access to blogs written by industry experts

Current information on cutting-edge technologies

Access to various industry resource links and articles related to IT and IT careers

Content Seal of Quality

This text bears the seal of CompTIA Approved Quality Content. This seal signifies that this content covers 100% of the exam objectives and implements important instructional design principles. CompTIA recommends multiple learning tools to help increase coverage of the learning objectives. Look for this seal on other materials you use to prepare for your certification exam.

Why CompTIA?

Global recognition CompTIA is recognized globally as the leading IT nonprofit trade association and has enormous credibility. Plus, CompTIA’s certifications are vendor neutral and offer proof of foundational knowledge that translates across technologies.

Valued by hiring managers Hiring managers value CompTIA certification because it is vendor- and technology-independent validation of your technical skills.

Recommended or required by government and businesses Many government organizations and corporations either recommend or require technical staff to be CompTIA certified (Dell, Sharp, Ricoh, the US Department of Defense, and many more).

Top ranking Three CompTIA certifications ranked in the top 10. In a study by DICE of 17,000 technology professionals, certifications helped command higher salaries at all experience levels.

How to Obtain More Information

Visit us online at www.comptia.org to learn more about getting a CompTIA certification. And while you’re at it, take a moment to learn a little more about CompTIA. We’re the voice of the world’s IT industry. Our membership includes companies on the cutting edge of innovation.

To contact CompTIA with any questions or comments, please call 866-835-8020, ext. 5, or email questions@comptia.org.

Find us on the following social media sites:

Facebook

LinkedIn

Twitter

YouTube

Terry Erdle

Executive Vice President, Skills Certification,

CompTIA

Introduction

If you’re like most of us in the networking community, you probably have one or more network certifications. If that’s you, you’re very wise in choosing a CompTIA Network+ (N10-005) certification to proudly add to your repertoire because that achievement will make you all the more valuable as an employee. In these challenging economic times, keeping ahead of the competition—even standing out among your present colleagues—could make a big difference in whether you gain a promotion or possibly keep your job instead of being the one who gets laid off! Or maybe this is your first attempt at certification because you’ve decided to venture into a new career in information technology (IT). You’ve realized that getting into the IT sector is a good way to go because as the information age marches on, the demand for knowledgeable professionals in this dynamic field will only intensify dramatically.

Either way, obtaining certification is one of the best things you can do for your career if you are working in, or want to break into, the networking profession because it proves that you know what you’re talking about regarding the subjects in which you’re certified. It also powerfully endorses you as a professional in a way that’s very similar to a physician being board certified in a certain area of expertise.

In this book, you’ll find out what the Network+ exam is all about because each chapter covers a part of the exam. I’ve included some great review questions at the end of each chapter to help crystallize the information you learned and solidly prepare you to ace the exam.

A really cool thing about working in IT is that it’s constantly evolving, so there are always new things to learn and fresh challenges to master. Once you obtain your Network+ certification and discover that you’re interested in taking it further by getting into more complex networking (and making more money), the Cisco CCNA certification is definitely your next step; you can get the skinny on that and even more in-depth certifications on my blog at www.lammle.com/forum.

What Is the Network+ Certification?

Network+ is a certification developed by the Computing Technology Industry Association (CompTIA) that exists to provide resources and education for the computer and technology community. This is the same body that developed the A+ exam for PC technicians.

Way back in 1995, members of the organization got together to develop a new certification that tests skills for IT. To ensure industry-wide support, it was sponsored by many past and present IT industry leaders like these:

Compaq Computers

Digital Equipment Corporation (a part of Compaq)

IBM

Lotus

Microsoft

Novell

TSS

U.S. Robotics

US West

Wave Technologies

The Network+ exam was designed to test the skills of network technicians with 18 to 24 months of experience in the field. It tests areas of networking technologies such as the definition of a protocol, the Open Systems Interconnection (OSI) model and its layers, and the concepts of network design and implementation—the minimum knowledge required for working on a network and some integral prerequisites for network design and implementation.

Why Become Network+ Certified?

Because CompTIA is a well-respected developer of vendor-neutral industry certifications, becoming Network+ certified proves you’re competent in the specific areas tested by the Network+ exam.

The following are the major benefits are associated with becoming Network+ certified:

Proof of professional achievement Networking professionals are pretty competitive when it comes to collecting more certifications than their peers. And because the Network+ certification broadly covers the entire field of networking, technicians want this certification a lot more than having just Microsoft certifications—Network+ is a lot more prestigious and valuable. Because it’s rare to gain something that’s worth a lot with little effort, I’ll be honest—preparing for the Network+ exam isn’t exactly a lazy day at the beach. (However, beaches do happen to be really high on my personal list of great places to study!) And people in IT know that it isn’t all that easy to pass the Network+ exam, so they’ll definitely respect you more and know that you’ve achieved a certain level of expertise about vendor-independent networking-related subjects.

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!

Lesen Sie weiter in der vollständigen Ausgabe!