Internet revision

What is the internet?
1. A network of networks
2. This is connected by a common set of protocols
3. Used world wide
Digital and analogue
1. Computer use digital signals
2. Telephone systems use analogue signals
3. You have to use a modem to convert between the two.
File Types
1. Image file
  1. JPEG
  2. GIF
    1. only 256 colours
  3. PNG
2. audio file
  1. MP3
3. Document file
  1. PDF
    1. Can be read on multiple devices
4. video file
  1. MPEG
Router
1. Moves data packet along
2. Finds the fastest route
DNS server
1. Domain Name System server
  1. from domain name
    1. To IP addresses
HTML
1. Hyper Text Mark-up Language
2. Can be read by multiple web browsers

Resource summary

	Created by Carenza Spence over 8 years ago