TECHNICAL ISSUES
Internet routers are dynamic, as they speak to one another, automatically updating their routing tables.
Task 4 Answer the following questions. 1. What is a multiplexor and what does it do? 2. What is a router and what does it do? 3. What are routing tables and what do they contain? 4. How are routing tables updated?
Uniform resource locator (URL) The Internet allows the user to locate different resources. The resource might be a piece of text, or an image or a means of booking a holiday. A resource is a file that is stored somewhere on the Internet. Every file needs a unique web address.
A URL is the unique web address of the resource, for example; • http://www.mywebsite.co.uk/internet/routers/tables.html • http://www.mywebsite.co.uk/internet/router/images/server.gif The first URL will locate a web page, while the second will locate an image. URL structure All URLs require the following elements in their structure: • • • •
protocol domain name path file identifier.
THE INTERNET UNIT (H, INFORMATION SYSTEMS)
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