Networks

Main Topics of Study:

A. Types of Networks

  • Definitions of LAN, WAN and the distinction between them
  • Advantages and disadvantages of networking in general compared with stand-alone systems
  • Advantages and disadvantages of networking in a particular situation
  • Definition of Bandwidth. Importance of bandwidth
  • Open Systems Interconnection (OSI)

B. LAN

  • Network topologies – Star, Bus, Ring, peer-peer
  • Advantages and disadvantages of each of the main types of network
  • Factors affecting speeds of networks
  • How signals are passed and controlled in each of the network types
  • The client-server

C. WAN

  • Analogue and digital signals. Roles of the modem and multiplexer. Time Division Multiplexing (TDM). Frequency Division Multiplexing (FDM). ISDN
  • Polling individual workstations
  • Switching techniques – circuit, message, packet
  • EDI. Uses made by business. Advantages compared with traditional communications
  • EFT. Uses made by business. Advantages compared with traditional payment methods
  • ATM usage by banks. The sequence of events WITHIN THE COMPUTER for a successful transaction in TECHNICAL terms

D. Internet

  • Its origins
  • Business use of internet
  • Uniform Resource Locators (URL). Domain name. Domain name suffix. IP address
  • Components of the Internet. WWW. E-mail, File Transfer Protocol Servers, News
  • Use of internet by individuals
  • Use of internet by business and organisations
  • Setting up your own domain name
  • Search engines. Structuring queries to eliminate irrelevant information
  • Cookies
  • Affects on society – good and bad

E. E-mail

  • Registering for e-mail and logging on
  • The e-mail system as seen by the user
  • How to send and receive e-mail. Attachments
  • Options open to the user on receiving an e-mail message

F. Hypertext Markup Language (HTML) and JAVAscript

  • Purpose of the HTML language
  • Format of the HTML language
  • Simple web pages in HTML
  • Javascript. Applets. Simple examples

G. Data transfers

  • Hypertext Transfer Protocol (HTTP)
  • File transfer Protocol (FTP)
  • Transmission Control Protocol (TCP)
  • JPEG, MPEG formats

H. Control of a network and its security

  • Role of the network supervisor/manager
  • Password systems. Allocation of passwords. Levels of access
  • Network threats. Viruses and their control
  • Hacking. Firewall
  • Encryption. Public key encryption

F