Network+ Study Guide / Edition 3

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Overview

Here's the book you need to prepare for the Network+ exam.

This proven Sybex Study Guide provides:

  • In-depth coverage of every exam domain--all the information you need
  • Practical information on essential networking tasks
  • Hundreds of challenging review questions, in the book and on the CD
  • Leading-edge exam preparation software, including a custom testing engine and electronic flashcards

Authoritative coverage of all Network+ exam domains:

  • Media and topologies
  • Protocols and standards
  • Network implementation
  • Network support

Note: CD-ROM/DVD and other supplementary materials are not included as part of eBook file.

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Editorial Reviews

From Barnes & Noble
The new edition of this Network+ bestseller is completely updated for CompTIA's latest exam tweaks. It covers it all: fundamental concepts, TCP/IP protocols and troubleshooting utilities, network installations and upgrades, remote access, security, fault tolerance, disaster recovery, and troubleshooting. Comes with a complete PDF copy, plus bonus electronic flashcards for PC and Palm. Who says you can't take it with you?
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Product Details

  • ISBN-13: 9780782140149
  • Publisher: Wiley, John & Sons, Incorporated
  • Publication date: 1/21/2002
  • Series: Study Guide Series
  • Edition description: 3rd Edition
  • Edition number: 3
  • Pages: 578
  • Product dimensions: 7.91 (w) x 9.34 (h) x 1.52 (d)

Meet the Author

David Groth is President and Chief Consultant of Devarim Inc., of Fargo, North Dakota. He is the author of the best-selling A+ Complete Study Guide from Sybex, as well as the I-Net+ Study Guide. Groth holds many technical certifications, including Network+, A+, I-Net+, MCP, and CNI.
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Read an Excerpt

Chapter 4: TCP/IP Utilities

With the vast array of people using TCP/IP on their net-works, we must have a way to test IP connectivity. Because Microsoft makes the majority of client platforms, the Network+ exam tests the basic concepts of the function and use of the TCP/IP utilities that come with Windows 95/98 and NT. You can use several utilities to verify TCP/IP function on Windows workstations, including:
  • ARP
  • netstat
  • nbtstat
  • FTP
  • Ping
  • ipconfig/winipcfg
  • tracert
  • Telnet
  • nslookup

Using the Address Resolution Protocol (ARP)

The Address Resolution Protocol, or ARP, is part of the TCP/IP (Transmission Control Protocol/Internet Protocol) protocol stack; it is used to translate TCP/IP addresses to MAC (media access control) addresses using broadcasts. When a machine running TCP/IP wants to know which machine on an Ethernet network uses a particular IP address, it will send an ARP broadcast that says, in effect, “Hey! Who is IP address xxx.xxx.xxx.xxx?”

The machine that owns the specific address will respond with its own MAC address. The machine that made the inquiry then adds that information to its own ARP table.

In addition to the normal usage, the ARP designation refers to a utility in Windows 95/98 and NT that you can use to manipulate and view the local workstation's ARP table.

The Windows ARP Table

The ARP table in Windows 95/98 and NT is a list of TCP/IP addresses and their associated physical (MAC) addresses. This table is cached in memory so that Windows doesn't have to perform ARP lookups for frequently accessed TCP/IP addresses (for example, servers and default gateways). Each entry contains not only an IP address and a MAC address, but a value for Time to Live (TTL), which indicates how long each entry stays in the ARP table.

The ARP table contains two kinds of entries:

  • Dynamic
  • Static
Dynamic ARP table entries are created whenever the Windows TCP/IP stack makes an ARP request and the MAC address is not found in the ARP table. The ARP request is broadcast on the local segment. When the MAC address of the requested IP address is found, that information is added to the ARP table.
Note
Periodically the ARP table is cleared of dynamic entries whose TTL has expired to ensure that the entries are current.

Static ARP table entries serve the same function as dynamic entries, but are made manually using the ARP utility.

The ARP Utility

To start the ARP utility in Windows 95/98, follow these steps:
1. Choose Start -> Programs -> MS-DOS Prompt to open the MS-DOS Prompt window.

2. At the command prompt, type ARP and any switches you need.

To start the ARP utility in Windows NT, follow these steps:

1. Choose Start -> Programs -> Command Prompt to open the Command Prompt window.

2. At the command prompt, type ARP and any switches you need.


Note
Entered alone, the ARP command lists only the switches you must use in order to use the ARP utility correctly.

The ARP utility is primarily useful for resolving duplicate IP addresses. For example, your workstation receives its IP address from a DHCP (Dynamic Host Configuration Protocol) server, but it accidentally receives the same address as another workstation. When you try to ping it, you get no response. Your workstation is trying to determine the MAC address, and it can't do so because two machines are reporting that they have the same IP address. To solve this problem, you can use the ARP utility to view your local ARP table and see which TCP/IP address is resolved to which MAC address. To display the entire current ARP table, use the ARP command with the –a switch, like this:

ARP –a

You'll see something similar to the following...


Tip
The –g switch will accomplish the same result.

From this output, you can tell which MAC address is assigned to which IP address. Then, by examining your network documentation (you do have it, don't you?), you can tell which workstation has the IP address and if it is indeed supposed to have it.


Note
If the machine has more than one network card (as may happen in Windows NT machines), each interface will be listed separately.

In addition to displaying the ARP table, you can use the ARP utility to manipulate it. To add static entries to the ARP table, use the ARP command with the –s switch. These entries stay in the ARP table until the machine is rebooted. A static entry hard-wires a specific IP address to a specific MAC address so that when a packet needs to be sent to that IP address, it is sent automatically to that MAC address. Here’s the syntax...

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Table of Contents

Introduction.

Assessment Test.

Chapter 1: Network Fundamentals.

Chapter 2: The OSI Model.

Chapter 3: TCP/IP Fundamentals.

Chapter 4: TCP/IP Utilities.

Chapter 5: Major Network Operating Systems.

Chapter 6: Network Installation and Upgrades.

Chapter 7: WAN and Remote Access Technologies.

Chapter 8: Network Access and Security.

Chapter 9: Fault Tolerance and Disaster Recovery.

Chapter 10: Network Troubleshooting.

Glossary.

Index.

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Sort by: Showing all of 4 Customer Reviews
  • Anonymous

    Posted October 21, 2003

    A good book for the experienced

    This is a good book for those of you with some networking experience. If you're BRAND new to networking you should probably go for something a bit more basic (but then again, you probably aren't ready for the Network+ exam). The CD-ROM was very helpful in nailing down the right answers for the test. With a bit of experience and the CD-ROM, you don't even need to read the book.

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  • Anonymous

    Posted April 10, 2003

    This book is all you need.

    The author is awesome. This book gets right down to everything you need to know to pass the Network+ exam. I read this book straight through in two days, took notes for the next few days, walked in and took the test and got an 880 of 1000. Passing is a mid-600 score. If you've got a background in IS/IT or an A+ cert already, this book plus your current knowledge will be more than enough to pass the Net+. I highly recommend this book... it's all you'll need.

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  • Anonymous

    Posted November 16, 2000

    The Foundation of Network+ Exam Preparation

    I used this text as the basis (along with a video set, and a practice exam text) for preparing for the Network+ exam. The information accurately represented the requirements for completing the actual test. After all, the authors helped develop the Network+ program. To those who think this book is too advanced, remember that CompTIA recommends the Network+ exam for people with 18 - 24 months experience. The only problems I found in the book were some review questions with questionable answers, and some vagueness in the DOD standards section. Watch out for these questions: CH1#6, CH3#4, CH3#14, CH3#15, CH10#13, and CH10#20. Some of these have incorrect answers. Others are never covered in the text. As far as the DOD section, take the author's advice, and check out the web site for the red/orange books for a definitive list of which NOSs are/aren't certified. BOTTOM LINE:I found the book easy to read, an excellent preparation tool for the Network+ exam, and I'm keeping it around the office, as it's a pretty good reference as well.

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  • Anonymous

    Posted April 30, 2000

    Not as good as I expected

    Before buying this, I had read some reviews on it, and it seemed to me that it was a good book. However, maybe i expected too much. It turns out to be a disapppointment. For example, when the author introduces FTP Proxy, what he simply says is, 'An FTP proxy operate in a fashion similar to that of a Web proxies.' How are they similar? Why are they similar? As a beginner, I want to know more, but the book doesn't tell me the answer. In fact, this book only tells me the information that I can get by turning on my computer. I am buying another book on Network+, and hope it will give me more thorough explanation on the subjects.

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