Chapter 6- The Internet Flashcards
Explain the purpose of DNS servers (3 marks)
DNS servers are computers on a network like the Internet that convert human readable domain names such as www.hoddereducation.co.uk into numerical IP addresses for the purpose of routing messages
What is a cascading style sheet? (3 marks)
Cascading style sheets are a means of describing the look of the web page that has been written in a markup language such as HTML. They allow separation of content from appearance and also help to apply consistent look across multiple webpages
What is HTML tag? (4 marks)
And HTML tag is part of a document written in HTML. It consists of the name of the enclosed in angle brackets such as <h1> for a top level heading. It defines the type of element and hence how is interpreted by a browser. The defined element is usually terminated by a similar tag with a slash i.e. </h1>
Explain why compression must be lossless when sending a computer program as an email attachment (2 marks)
Lossless compression allows the exact restoration of the file. A computer program will not work properly if any of it is missing, so lossy compression cannot be used
Explain what is meant by IP addressing. (2 marks)
Internet protocol addressing is the use of IP addresses in order to identify a resource on a network
Describe what HTML is (3 marks)
Hypertext markup language is the language used for creating webpages, it is textbased and interpreted by a browser
Explain the purpose of HTML in the creation of webpages (3 marks)
HTML uses tags and other elements i.e. <h1> to indicate how parts of pages are to be displayed</h1>
Describe one advantage and one disadvantage of storing music as MP3 files. (2 marks)
Advantage: Does not take up a lot of storage Disadvantage: Could loose detail
What is file compression? (4 marks)
File compression is the reduction in the size of a file so it takes less storage and less time to transmit across a network. Lossy compression involves the removal of data and the original file cannot be recovered
