I-Net+ Exam Notes

Overview

i-Net+ Exam Notes is the fastest, most effective way to make sure you're ready for the i-Net+ exam. The unique Exam Notes approach helps you gain and retain the knowledge you need, objective by objective:
  • Critical Information sections outline and analyze the key issues for each exam objective.
  • Exam Essentials sections highlight the subject areas you absolutely must know to ...
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Overview

i-Net+ Exam Notes is the fastest, most effective way to make sure you're ready for the i-Net+ exam. The unique Exam Notes approach helps you gain and retain the knowledge you need, objective by objective:
  • Critical Information sections outline and analyze the key issues for each exam objective.
  • Exam Essentials sections highlight the subject areas you absolutely must know to pass the exam.
  • Key Terms and Concepts sections define the words and concepts that play a central role in passing the exam.
  • Sample Questions sections provide examples of the types of questions found in the exam, along with answers and explanations.
Polish up your knowledge and raise your confidence level in all six exams domains: Internet Basics, Internet Clients, Development, Networking and Infrastructure, Internet Security, and Business Concepts
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Product Details

  • ISBN-13: 9780782126389
  • Publisher: Sybex, Incorporated
  • Publication date: 3/1/2000
  • Edition number: 1
  • Pages: 320
  • Product dimensions: 5.86 (w) x 8.21 (h) x 0.88 (d)

Meet the Author

David Groth is President and Chief Consultant of Devarim, Inc., and the author of A+ Complete Study Guide, Network+ Study Guide, and i-Net+ Study Guide, all from Sybex. He holds many technical certifications, including Network+, A+, MCP, and CNI.

Dorothy McGee is a computer professional with over 14 years of experience and the co-author of A+ Certification Study Guide and CNE NetWare 5 Study Guide, both from Osborne/McGraw-Hill. She holds several technical certifications, including CNE, MCNE, MCP, and MCSE

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Read an Excerpt

Chapter 4: Networking and Infrastructure

Over the past ten years, the Internet has virtually exploded in its size and popularity. One of the reasons that the Internet enjoys such acceptance is its ease of use through software applications, such as Web browsers and e-mail clients. However, most people do not understand what the Internet is or how it works. In this chapter, you will learn about the Internet's infrastructure and the various types of communication lines used to create it, protocols that are used on the Internet, and diagnostic aids used in troubleshooting Internet connectivity problems.

Describe the core components of the current Internet infrastructure and how they relate to each other. Content may include the following:

  • Network access points
  • Backbone
The Internet has often been called the "Information Super-highway" for a good reason. Just as a highway has an underlying infrastructure to allow vehicles to travel over it in an efficient manner, or as efficient as traffic will allow, the Internet is also arranged to allow data to travel through it. You can see the logic behind this analogy in Figure 4.1. In this objective, you will learn about the var-ious structural components of the Internet.

Critical Information

The main roads of a highway system carry the bulk of the traffic, with on- and off-ramps to allow vehicles to enter and exit the system. The Internet is also designed in this fashion. The Internet's main road, called a backbone, handles most of the data transportation. When data is transmitted from a client, it must find an on-ramp (access point) to gain entry to the backbone. The data exits the backbone through another access point (an off-ramp) to reach its destination. You will take a look at the two major parts of the Internet in the succeeding sections:
  • Network access points
  • Backbone

Network Access Points

Before a car can travel on a superhighway, it must first find an on-ramp that connects to the superhighway itself. Similarly, when you wish to access the information on the Internet you must use an "on-ramp," or access point, to the Internet. An Internet service Provider, or ISP, functions as an access point to Internet resources by providing a high-speed WAN (wide area network) connection either into an ISP that has a connection into a backbone provider or directly into a network access point. As mentioned previously, network access points form the backbone of the Internet and are therefore ISPs themselves.

ISPs earn their money by leasing portions of their bandwidth to other ISPs, companies, or individuals. When you purchase an Internet connection from an ISP, you are really leasing part of their bandwidth. Some ISPs have a tendency to oversell their bandwidth, which usually results in a very slow Internet connection. When ISPs oversell their capacity, they are usually banking on the fact that most people do not spend hours constantly connected to the Internet retrieving information, which is called surfing.

In addition to an Internet connection, an ISP usually runs a high-speed LAN (local area network) that hosts a mail server, a news server, and several Web servers. Besides the basic Internet services that come with a lease, many ISPs offer server hosting (also known as Web hosting) services. Because of the expense of running a Web server on the Internet, many companies and home businesses find it more economical to pay an ISP to manage and maintain a Web server. For companies looking to increase the performance of their Web servers, and who have the resources to afford the service, the best method is to obtain Web hosting services from a backbone provider, who can put the server directly onto the Internet backbone.


NOTE Because Web hosting has become so lucrative, you may find some ISPs whose only business is to provide Web hosting services. If you or your company is looking to obtain such services, it is prudent to inquire as to the type of Internet connection in use. Some ISPs have direct connections into the Internet backbone, which gives the best performance but is the most expensive, while others have a connection into a backbone provider.

Backbone

Internet Service Providers provide Internet access to companies and individuals. However, a few ISPs have the task of providing high-speed WAN connections to other ISPs. These high-speed WAN connections between ISPs typically run at speeds between 100Mbps and 1Gbps, and form the Internet backbone. ISPs that provide backbone connections are called backbone providers or network access points (NAP). Since WAN connections are generally leased from telephone companies, most backbone providers are actually divisions of telephone companies, such as Sprint, MCI, and AT&T to name a few.
WARNING With the explosion of the Internet, new ISPs are being formed at a rapid rate that primarily service a single local area. As com-petition grows between ISPs, many have claimed that they are also backbone providers. However, this may not necessarily be the case since there are relatively few backbone providers, but they may have a connection into a backbone provider. Be careful with ISP claims when you choose one.

SEE ALSO For more information on this objective, see i-Net+ Study Guide, Chapter 2.

Exam Essentials

Know the difference between a backbone provider and a typical ISP. Backbone providers, or network access points, manage and maintain the high-speed WAN lines that form the Internet backbone. While backbone providers are ISPs, not all ISPs are backbone providers.

Understand the concept of server (Web) hosting. Some ISPs offer companies the option of hosting their Web sites on an ISP's Web server. This allows companies to reduce the overhead costs associated with maintaining their own Web servers....

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Table of Contents

Introduction
Chapter 1: i-Net Basics
Chapter 2: i-Net Clients
Chapter 3: Development
Chapter 4: Networking and Infrastructure
Chapter 5: i-Net Security
Chapter 6: Business Concepts
Index
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