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Lesson 2Internet Connection
ObjectiveDescribe the components of the Internet
The Internet connection
There are three parts to an Internet connection:
  1. The client
  2. The server
  3. The connection linking them

This configuration is called the client/server model. In the client/server model, one program requests a service from another program. The client makes a request; the server answers the request with a service. The client and server communicate with each other by both physical (hardware) and logical (software) links.
Client
A client consists of:
  1. A desktop computer (hardware)
  2. A program (software) that requests information from the server

The program usually resides on a personal computer. An example of such a program is a Web browser. When you want to see a particular Web site, the browser handles your request.


Server
Typically a server is a remote device shared by many users. A server can be:
  1. A machine that stores a particular resource you want to use, such as a database or Web pages
  2. A machine that performs specific functions such as sending and receiving e-mail
Servers are available commercially from companies including Sun Microsystems, Sequent, IBM, Unisys, Dell, Compaq, and NCR. The figure below illustrates the relation between a client and server connected through local and regional Internet Service Providers (ISPs).
In the next lesson, you will learn about the hardware and software you need to access the Internet.
Client/server connection
Interaction between Client and Internet server connection