Network+ Study Guide

Network+ Study Guide

by David Groth

Hardcover(Student Manual, Study Guide, etc.)

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Network+ Study Guide by David Groth

Network+ Certification Is Your Key to Better Job Opportunities and the Network+ Study Guide is the comprehensive resource you need to prepare for—and pass—this all-important exam. Inside, a networking expert who helped develop the test teaches you everything you need to know, linking all his instruction to specific exam objectives and equipping you with the knowledge and confidence you need to pass on the first try. Coverage includes:

  • Network topologies
  • Network operating systems
  • NOS clients and directory structures
  • Fault tolerance and high-availability
  • OSI reference model
  • TCP/IP fundamentals
  • TCP/IP addressing and configuration
  • TCP/IP suite utilities
  • Networking hardware and components
  • Networking media and connectors
  • Bridging and routing
  • Remote connectivity
  • Network security
  • Network installation
  • Network maintenance and support
  • Troubleshooting networks, servers, and clients

Product Details

ISBN-13: 9780782128635
Publisher: Sybex, Incorporated
Publication date: 01/01/2001
Edition description: Student Manual, Study Guide, etc.
Pages: 624
Product dimensions: 7.84(w) x 9.33(h) x 1.61(d)

About the Author

David Groth is President and Chief Consultant of Devarim, Inc., located in Fargo, North Dakota. Author of the best-selling A+ Complete Study Guide from Sybex, Groth holds a number of technical certifications, including A+ (DOS/Windows and Mac), MCP, and CNI.

Ben Bergersen holds many technical certifications including MCSE, MCT, CNA, CTT, and A+.

Tim Catura-Houser is an MCT and CTT and holds several multi-vendor certifications in system engineering hardware and software. All three authors participated in the development of the Network+ certification program.

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”

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.

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.

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...

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.

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...

Table of Contents

Assessment Testxxxiii
Chapter 1Network Fundamentals1
Network Elements3
Physical Topologies11
Physical Media21
Common Network Connectivity Devices34
Exam Essentials40
Key Terms41
Review Questions43
Answers to Review Questions48
Chapter 2The OSI Model51
Introducing the OSI Model52
The OSI Model's Lower Layers56
The OSI Model's Middle Layers76
The OSI Model's Upper Layers85
Networking Protocols87
Exam Essentials94
Key Terms96
Review Questions98
Answers to Review Questions103
Chapter 3TCP/IP Fundamentals105
Introducing TCP/IP107
The Transmission Control Protocol111
The Internet Protocol113
The Application Protocols116
Ports and Sockets Explained121
Understanding IP Addressing123
Name Resolution Methods136
Configuring TCP/IP on Windows Workstations142
Virtual LANs (VLANs)151
Key Terms152
Exam Essentials153
Review Questions155
Answers to Review Questions159
Chapter 4TCP/IP Utilities163
Using the Address Resolution Protocol (ARP)164
Using netstat167
The nbtstat Utility174
The File Transfer Protocol (FTP) Utility180
The Ping Utility185
The winipcfg and ipconfig Utilities187
The tracert Utility191
The Telnet Utility192
The nslookup Utility194
Exam Essentials196
Key Terms197
Review Questions198
Answers to Review Questions204
Chapter 5Major Network Operating Systems207
Novell NetWare208
Microsoft Windows NT223
Unix Flavors234
Macintosh OS237
Exam Essentials242
Key Terms243
Review Questions244
Answers to Review Questions249
Chapter 6Network Installation and Upgrades251
Before Installing New Hardware or Software252
Network Components266
Network Connectors274
Installing a NIC278
Workstation Configuration288
Network Installation Tools296
Exam Essentials304
Key Terms305
Review Questions307
Answers to Review Questions312
Chapter 7WAN and Remote Access Technologies315
Remote Access Connection Configuration Requirements317
Remote Access Connection Methods321
Remote Access Protocols331
Exam Essentials337
Key Terms338
Review Questions339
Answers to Review Questions345
Chapter 8Network Access and Security347
Accessing Network Resources349
Client Selection349
Managing User Account and Password Security355
Using Firewalls364
Attack and Defense376
DoD Security Standards380
Understanding Encryption384
Security Policies389
Exam Essentials395
Key Terms396
Review Questions397
Answers to Review Questions403
Chapter 9Fault Tolerance and Disaster Recovery405
Assessing Fault Tolerance and Disaster Recovery Needs407
Power Management412
Disk System Fault Tolerance419
Backup Considerations424
Virus Protection436
Software Patches441
Key Terms444
Exam Essentials445
Review Questions447
Answers to Review Questions453
Chapter 10Network Troubleshooting455
Narrowing Down the Problem457
Troubleshooting Steps464
The Troubleshooter's Resources470
Troubleshooting Tips494
Exam Essentials499
Key Terms500
Review Questions501
Answers to Review Questions507

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Network+ Study Guide 3.8 out of 5 based on 0 ratings. 4 reviews.
Guest More than 1 year ago
First, I passed the exam. For the most part, this was because the book did a good job of laying out the requirements for the exam and giving good examples of test questions. The book even had ambiguous questions that had their counterpart in the exam. However, there were many exam questions that could not be answered correctly by material from the book alone. I relied on my experience and information gathered from other certification studies (Microsoft and Cisco) to answer these questions. So I¿m saying that if you are new to networking and computers in general, this book will not be enough to pass the Network+ exam. If you have experience in networking or have passed the MCSE or Cisco exams, this book does a good job of giving you the feel of the questions and highlights the type of information you will be required to know to pass.
Guest More than 1 year ago
Book is pretty good...Study it & take notes & you'll be on your way on being Net+ certified. However practice questions are nothing like the actually exam questions.
Guest More than 1 year ago
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.
Guest More than 1 year ago
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.