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Chapter 2 Communication and Internet Technologies Learning objectives By the end of this chapter you should be able to: ■ ■ ■ ■ ■ ■ ■
explain the client–server model of networked computers give examples of applications which use the client–server model describe what is meant by the World Wide Web (WWW) and the Internet explain how hardware and communication systems are used to support the Internet explain the benefits and drawbacks of using copper cable, fibre-optic cabling, radio waves, microwaves, satellites show understanding of bit streaming and the importance of bit rates/broadband speed on bit streaming explain the format of an IP address and how an IP address is associated with a device on a network
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explain the difference between a public IP address and a private IP address and the implication for security ■ explain how a Uniform Resource Locator (URL) is used to locate a resource on the WWW and the role of the Domain Name Service ■ describe the sequence of events executed by the client computer and web server when a web page consisting only of HTML tags is requested and displayed by a browser ■ recognise and identify the purpose of some simple JavaScript and PHP code and show understanding of the typical use of client-side code in the design of an application.