Networks

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  • Networks (1)
    • LAN
      • Local area network
      • connects a set of computers and other devices
      • installed on one site
      • does not cover a wide area
      • all owned by organisation who owns the LAN
    • WPAN
      • Wireless personal area network
    • WAN
      • Wide area network
      • covers a large geographicalarea
      • e.g. internet
    • VPN
      • Virtual private network
      • when the internet is used to provide connectivity between nodes
    • switches
      • reduces traffic
        • data is confined to segments needed
      • smart device
        • connects to different segments of network automatically
    • routers
      • sends data to networks
      • works with data packets
    • Wireless access points
      • pros
        • no building work needed
        • quick to add new stations
        • flexible deployment of node
        • visitors allowed access
      • cons
        • slower performance
        • security issues
    • NIC
      • Network interface cards
      • enable devices to connect with networks
      • smartphones
        • GSM chips
    • Hub
      • connects nodes together
      • each act as one segment
      • cheap
    • Protocols
      • rules for communication between devices
      • encourage network development
      • constructed in layers
    • IP Addresses
      • uniquely identifies the node
      • DNS servers convert domain names into IP addressses
    • MAC addressing
      • Media access control
      • Unique number on network interfaces
      • communicates physical layer
    • Packets
      • data is split into these
    • Security
      • Data is vunerable
      • access levels, passwords, encryption
    • policies
      • protect assets

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