1.4 Wireless and Wired Network Version 2

1.4 Wireless and Wired Network Version 2

1. LAN

   • Local Area Network
   • Computers connected together over a small geographical area
     • A building
     • Home
     • School
   • Own infrastructure and network hardware due to distance and pracicalities

2. WAN

   • Wide Area Network
   • Computers connected together over a large geographical area
     • Several buildings/sites
     • Town
     • County/Country
   • Uses external hardware and external infrastructure e.g. use of The Internet and Satellites

3. Internet + WWW

   • Accessible, store and look things up on there
   • World Wide Web
     • Isn't accessible
     • Files, programs and websites
   • Infrastructure
     • Raters
     • Servers and hardware

4. Client-server

   • Provides all services on the network through a central computer
   • Network relies on central server
   • Data/files are sent to the server and then transferred to another device
   • Expensve to build and maintain
   • Requires a dedicated network manager
   • Recieves and processes data from all computers

5. Peer to Peer

   • Cheap to set up and computers are needed to be maintained individually
   • All computers have equal status
   • No additional hardware required
   • Each device can act as a client and server

6. Keywords

   • Packet
     • Data transmitted over a network is broken down into packets
     • Contains the IP address of the sender and reciever
     • Contains a sequence number (A certain life time on the internet)
   • WAP
     • Wireless Access Point
     • Has wires connected to the point
     • Allows a person to access the internet/network wirelessly
     • Part of the internet
     • Performs better with less interference like walls
       • Closer to the device has a strong signal
   • Network performance
     • The speed of the message which can be sent or a document can be retrieved
     • Affected by the number of devices on the network or of the bandwidth transmission medium
   • Transmission media
     • A pathway that carries the information from sender to receiver by cable, wires or electromagnetic signals
   • Modem
     • MODulate and DEModulate

7. More keywords

   • Hub
     • Can only work with one device at a time
   • Router
     • Transmit data between at least two different networks
   • Switch
     • Works with a lot of devices at the same time
   • VPN
     • Virtual Private Network
     • Sends data over a WAN

8. Bandwidth

   • The amount data that can be transmitted in a period of time
   • Impact bandwidth can have on the performance of a network...
     • Large number of users will result in the bandwidth being limited
     • Insufficient bandwidth reduces quality of a video/photo/etc
     • Larger amount of available bandwidth means more data that can be transmitted

9. Fibre Optic

   • Transmit data through light so it does not suffer from electrical interference
   • Has a higher bandwidth than copper cables

10. Cloud Computing

    • Automatically backs up data
    • Able to share data/files within the cloud

11. The 8 Principles of DPA

    • Fairly
      • Obtained
    • Law
      • Holders of the data provide full transparency about how they wish to use the data, as well as ensure their data is only used in ways the person would expect
    • Adequate
      • The amount of data held must be the necessary amount for it's purpose
    • Accurate
      • Data must be kept up to date. The data needs to be changed when it is inaccurate
    • Kept
      • Data must be kept for no longer as it should be (Data must be deleted or removed). This allows other data to be managed easier
    • Secure
      • Data must be kept secure within a physical and technical system to keep information safe and secure from security risks
    • Transfer
      • Country that the data is being sent to needs to have a robust DPA and the workers maintaining the data must be properly trained and checked
    • Specific
      • Data should only use the personal data for the purpose they originally said it would be used for

12. DNS Server

    • Domain Name System/Server
    • Contains all the domain names and their IP addresses
    • Packets are transmitted as IP addresses. This is why we need to know the IP address to access a website
      • Without DNS, we need to type in the IP address all the time