comp science 2.0

• A Wide Area Network (WAN) is a network that covers a large

  geographical area, connecting multiple LANs together.

  The internet is the biggest WAN/
• A Local Area Network (LAN) is a network of connected devices, like

  computers and printers, within a single building or location, such as a

  home, office, or school, allowing them to share resources and

  information
• A router connects a Local Area Network (LAN) to a Wide Area

  Network (WAN), such as the Internet
• Two or more computers connected together so that they can

  communicate (via email / SMS/ etc) , share files and resources (e.g.

  router, printer etc)
• Topology: The layout of connections between devices, like computers or

  phones, showing how they're linked or arranged in a network.
• Switch: A network switch is like a traffic manager for a local network,

  directing data between the connected devices.
• Server: A powerful computer in a network that stores files and data and

  manages resources (such as printers) for other computers to access

  and use.
• Client server network -

  Devices (clients) request services/data from a central computer

  (server).

  For example the main school server provides your computer (the

  client) with access to Google Classroom, your emails, the printers etc.
• Encryption: Converting text and data into a coded form (ciphertext) so it can’t be understood by someone unless they know how to decode it.
• cipher text: An encrypted message
• Decryption is converting encrypted, unreadable data (ciphertext)

  back into its original, understandable form using a decryption key.