4.1.8 networks

4.1.8 networks

1. WAN

   • Wide area network
     • allow LANS to be connected together

2. networks

   • Networks are groups of computers or terminals linked together by network cabling or wireless links. A computer that is not part of a network is called a stand-alone computer. Stand-alone computers can only access data files stored on that computer. They will need their own peripherals
     • confined to a organisation or company
       • ADVANTAGES
         • can only be accessed with a password
         • manager can observe what workers are doin
         • share Peripherals (printers etc)
         • collabrative work with other employees
         • manager can set restrictions on what employees have access to
         • technical support can be centrilised
         • central installation of software (anti virus)
         • data files can be stored on a central computer so that all workstations have access to them
         • security and back ups controlled by the central computer
       • DISADVANTAGES
         • expensive to set up
         • if server fails work output is hindered
         • not as secure as standalone machines
         • virus can spread quickly through a network
         • if there is a lot of network traffic it could slow it down
         • technical knowledge is required to set up
     • use at home
       • ADVANTAGES
         • parents can observe what children are doing
         • easily access files from others
         • peripherals can be linked
         • anti virus can be installed centrally
         • central backup
         • 2 people can access the same document at once
       • DISADVANTAGES
         • health problems with wireless networks
         • money needed for wires
         • mess and disruption if whole house needs re wireing

3. internet

   • a global network of networks

4. extranet

   • intranets but can be accessed by selected users from other organisations

5. intranet

   • private internal networks

6. LAN

   • local area network
     • confined to a geographic area or eltablishment
     • communication is usually in copper, optic cables and/ or wireless