Computer Science OCR 1.3.2

Computer Science OCR 1.3.2

1. Protocols

   • Protocols are rules a network must follow when performing a specific task
   • Layers
     • Application
       • Creates and interprets data
     • Transport
       • Splitting and joining of data
     • Physical
       • Convert data into electrical signals
     • Data link
   • Different protocols
     • HTTP
       • HTTPS
         • Http but has encryption
       • Hypertext transfer protocol
     • TCP
       • Transfer control protocol
         • Splits data from applications into packets
     • Ethernet
       • Defines how data should be physically transmitted
     • FTP
       • File transfer protocols
     • Different email protocols
       • POP3
       • IMAP
         • Better protocol
     • IP
       • Internet protocol
     • WIFI

2. Transmission Media

   • Wired
     • Ethernet and Fibre optics
     • Faster
   • Wireless
     • Wifi + bluetooth and Radio waves

3. Encryption

   • Scramble data over the network so data intercepters don't get that data
   • Asymetric Encryption
   • Symetric Encryption

4. Addresses

   • IP adresses
     • IPv4 and IPv6