ITIS 1210 Introduction to Web-Based Information Systems

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ITIS 1210Introduction to Web-Based Information
Systems

• Chapter 4. Understanding the Internets Software
  Structure

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Understanding the Internets Software Structure

• Internet uses a Client-Server model
• Client
• Needs services
• Server
• Provides services
• Delivering Web pages or email

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Understanding the Internets Software Structure

• Client
• Local personal computer
• Server (host)
• Many manufacturers models
• Multiple operating systems
• Usually far more powerful than a normal PC

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Understanding the Internets Software Structure

• Why servers?
• So all clients dont have to have the same
  capabilities
• Many clients can access the same files or
  programs on a single server
• For WWW
• Client is browser running on your PC
• Server is a Web host somewhere on the Internet

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Understanding the Internets Software Structure

• Browser
• Sends request (for a Web page or file) to a
  server
• Server
• Processes request
• Sends answer back to client
• Client displays data from server

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Understanding the Internets Software Structure

• PC-based browser program controls client end
• Browser requests a Web page from the server
• Server processes request
• Host computer (server) houses the Web site
• Server sends requested data back to originating
  computer
• Software enables the server to retrieve specific
  pages and transmit them to clients

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Understanding the Internets Software Structure

• To a client, the Web appears to be
• Limitless file storage mechanism
• Distributed among thousands of computers
• Accessible to anyone with an Internet connection