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Internet Protocol Stack

  • The closer to this bullet, the higher level it is.
  • Application. FTP, SMTP, HTTP. Handles Messages. SSL belongs here
  • Presentation. Encryption, Compression. Machine specific.
  • Session. Synchronization, Checkpointing, Recovery.
  • Transport. TCP. UDP. TCP vs UDP. Handles Segments.
  • Network. IP. Routing Protocols. Handles Datagrams.
  • Link. Ethernet, Wi-Fi, Point-to-Point Protocol (PPP). Handles Frames.
  • Physical. Wire.
  • The closer to this bullet, the lower level it is.

Note that a TCP message is not a packet because it is a byte stream.

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