By the end of this sub-unit, you should be able to:

• show understanding of what is meant by transmission of data
• distinguish between serial and parallel data transmission
• show understanding of the reasons for choosing serial or parallel data transmission
• show understanding of the need to check for errors
• explain how parity bits are used for error detection
• identify current uses of serial and parallel data transmission, such as Integrated Circuits (IC) and Universal Serial Bus (USB)


By the end of this sub-unit, you should be able to:

  • show understanding of the security aspects of using the Internet and understand what methods are available to help minimise the risks
  • show understanding of the Internet risks associated with malware, including viruses, spyware and hacking
  • explain how anti-virus and other protection software helps to protect the user from security risks (this also links into section 1.4 of the syllabus)

By the end of this sub-unit, you should be able to:

  • show understanding of the role of the browser and Internet server
  • show understanding of what is meant by hypertext transfer protocol (http) and HTML
  • distinguish between HTML structure and presentation
  • show understanding of the concept of MAC address, Internet Protocol (IP) address and cookies