Network

Network

1. When computers are connected together and can communicate with each others

   • Types
     • LAN
       • Hardware
         • File Server
           • Main computer
           • More powerful
           • Large amount RAMS and hard disk
           • Holds OS
         • Network interface card
           • computer must have
           • Communicate with files server and other computers
         • Network cables
           • connect NIP to connect the server and computer
         • Switches
           • Connection points for all the terminal
         • Modem
       • Connection within the building
       • HW requirements
       • File server
         • Stores files, runs softwares
       • Terminal
         • Working stations
       • Print server
         • For printing
       • Cables
     • WANs
       • Hardware/Software
         • ISP
           • Internet Service Provider
           • Sells internet connection
         • Browser
           • Allows users to access to the internet
       • Connection in different area or countries
       • Required modem to connect wireless

2. Security

   • Hardware are protected physically
   • Some accessibility is limited

3. Topologies

   • Ring
   • Bus/Line
   • Star

4. Connecting to the internet

   • Required PC, Broadband modem, ISP software, Internet service provider, browser software

5. Communication

   • Bandwitch
     • Higher = quicker
   • Connection types
     • PSTN - Public Switched Telephony
       • Low bandwitch
       • Dial up
       • Uses telephone connection
     • ISDN - Integrated Service Digital Network
       • Support videoconferencing, faxes and voice applications
       • dial up
       • High speed digital transfer
     • ADSL - Asymmetric Digital Subscriber Line
       • "Broadband"
       • High bandwitch
       • Permanently on