Network protocols 3

  • Created by: Tomiwaq
  • Created on: 02-04-19 18:21
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  • Network protocols
    • TCP / IP
      • It is the protocol which dictates how data is sent between networks
      • It is made up of 2 protocols
      • Transmission Control Protocol
        • Sets the rules foe how devices connect to the network
        • It's in charge of splitting data into packets and reassembling them
        • It's in charge of checking if the data has been correctly sent and delivered
      • Internet protocol
        • Responsible for packet switching
    • Other protocols
      • Hyper Text Transfer Protocol Secure (HTTPS)
        • Used by web browsers to securely access websites
      • File Transfer Protocol
        • Used to access, edit and move files between devices on a network
      • Post  Office Protocol 3 (POP3)
        • Used to retrieve emails from a server
      • Internet Message Access Protocol (IMAP)
        • Used to retrieve emails from a server which holds the email until you actually delete it
      • Simple Mail Transfer Protocol (SMTP)
        • Used to send emails
    • Layers
      • A layer is a group of protocols which have similar functions
      • Layers are self-contained
      • Each layer serves the layer above it
      • The 4 layers
        • Layer 1 - Data link layer
          • Passing data over the physical network e.g. ethernet
        • Layer 2 - Network layer
          • Making connections between networks, directing data packets and handling traffic e.g. IP
        • Layer 3 - Transport layer
          • Controlling data flow e.g. TCP
        • Layer 4 - Application layer
          • Turning data into websites and other apps e.g. HTTP
    • Advantages
      • It breaks network communication into manageable pieces
      • They can be changed without the other layers being affected
      • Having set rules for each layer means it is compatible with other companies

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