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TCP/IP Model (ISO/OSI (7 Application Layer (Protocols (Telnet, FTP, HTTP,…

- - - - TCP Error Recovery
        
        Acknowledgements
        
        Sequence numbers
  - - - e.g. HTTP wants error recovery provided by TCP for getting a web page
- - - - Adressing & Routing
        
        each device needs a unique IP adress
      - IPv4
        
        x.x.x.x is called dotted-decimal notation (DDN)
      - IPv6
  - - - HTTP header
      - TCP header
      - IP header
        
        Source IP Adress
        
        Destination IP Adress
- - - - Transport Layer
        
        Segment
      - Network Layer
        
        Packet
      - Data Link Layer
        
        Frame
- - - - Telnet
      - FTP
      - HTTP
      - SMTP
  - - - e.g. ASCII, JPEG, PNG, ...
    - - TLS (Transport Layer Security)
      - SSL (Secure Shell)
  - - - PPTP (Point-to-Point-Tunneling Protocol)
      - NetBios
  - - - TCP
      - UDP
  - - - IP
  - - - Ethernet (IEEE 802.3)
      - HDLC
  - - - RJ-45
      - Ethernet (IEEE 802.3)
  - - - e.g. Layer3PDU = L3PDU
      - = LxPDU