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ICT lesson , 25 May note

17 - Communication software and Protocols

  • protocols : format , rule
  • email protocols : send - SMTP , recv - IMAP , PoP

sending / Reciving data

  1. application
  2. presentation
  3. Session (Establishing connection)
  4. Transport (Divide data in packets)
    • Transprot header packet + Packet + ...
  5. Network (IP)
    • NH + TH + Data -> package
  6. Data link
    • Data link header + packet + daat limit trailer -> error checking
  7. Physical
  • 4th layer
    • TCP ( transmission central protocol)
  • 5th layer
    • IP (internet protocol)

IP

IPv4

  • four set of number
  • each set 8-bit(0~255)
  • e.g : 2.9.4.87
  • maximum :2^32

IPv6

  • eight set of number
  • each set 4-bit hexadacimal
  • e.g : C876 : 3927 : 3110 : AAAA : dddd : 2022 : 0007 : 4968
  • maximum : 2^128