Digital Technology

Digital Technology

1. Networks

   • Sharing data, so you can share hardware , share resources
   • A network is a number of devices linked together to allow them to share resources
   • These resources will inlude Hardware, Software and Data
   • when creating a network, it is important to consider how the devices will be connected to each other
   • The connections could be arranged into different layouts

2. Packets

   • Each packet will have a destination address, is the device that it is trying to get to
   • Data is split into packets
   • For devices to communicate they will send data to each other

3. topologies

   • Mesh Network
     • Advantage: more connections between devices build a more stable network
     • Disadvantage: will take longer to add a new device
     • Disadvantage: will be more expensive to set up
   • Star Network
     • Advantage: Easy to set up, easy to add a new device
     • Advantage: It is reliable. If a device crashes, other devices are not effected
     • Disadvantage: There are no connections between devices. If the central hub crashes then the whole network of devices will be to communicate
   • Ring Network
     • Advantage: It is easy to set up. Each device is only connected to its closest partner
     • Disadvantage: If one of the connections/devices fail, then the network is greater disrupted
   • Bus Network
     • Each device on the network is connected to a central cable
     • Advantage: It is easy and cheap to setup
     • Disadvantage: if the central cable is damaged then the whole network will fail
     • Disadvantage: If there are lots of devices the central cable can become very busy and traffic will slow down the speed of data transfer

4. LAN

   • A LAN covers a small area such as one room or building
   • School and collages, small buisness, Indie games studio, LAN party, High Street shops
   • The network can share printers and files
   • Local Area Network

5. WAN

   • A WAN covers a large area such as a town or a large company
   • Supermarkets, KCOM, Goverments, Banks and Cash machines
   • Wide Area Network

6. Client server communication

   • It is the relationship between two computers in which one, the client, makes a service request from another, the server. The client is dependent on the server to provide and manage the information
   • When you get to google.co.uk, you are asking for google's homepage from google's servers

7. peer to peer communication

   • In the client-server model, many users trying to access a large file, such as a film, would put strain on one server
   • In the peer to peer model, many users on the network could store the same file
   • Each computer can then sections of the file, sharing the workload
   • Each client can download and share files with other users

8. Network Protocols

   • TCP = Transmission Network Protocol
   • IP = Internet Protocol
   • HTTP = Hyper Text Transfer Protocol
   • HTTPS= Hyper Text Transfer Protocol Secure
   • FTP = File Transfer Protocol
   • POP = Post Office protocol
   • IMAP = Internet Message Access Protocol
   • SMTP = Simple Mail Transfer Protocol

9. Digital Communication

   • Websites
     • Youtube
     • Krunker
     • Wikipedia
     • wesites are to inform
   • VoIP
     • Voice over Internet Protocol
     • It is referred to as Voice over Networks, Voice over Broadband
   • Social Media
     • Twitter
     • Facebook
     • Instagram
     • WattPad
     • Italki
     • Stickam
   • email
     • Gmail
     • Outlook
     • Yahoo
     • AQL mail
     • Mail.com
     • GMX mail
     • ProtonMail
   • Blogs
     • Blogs could go on social media - like Facebook, Twitter or Instagrams
     • Blogs could go on other websites like Youtube
     • when you put blogs on the internet, there is a good chance that you cant take it down from the internet

10. Image File Formats

    • .raw
    • .bmp
    • .jpg
      • this is used for when you want to put an image on a website
      • it is a lossy compression
      • Photographic images
    • .png
    • .webp
    • .wmf
    • .tiff
      • it is a lossless compression
      • it is in various forms of compression
    • .eps