Slide 15.6: The Open Systems Interconnect (OSI) model
Slide 15.8: A World Wide Web transaction
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The TCP/IP Model

The TCP/IP (Transmission Control Protocol/Internet Protocol) model, which resembles the OSI model, consists of four layers:

  • Application layer corresponds to OSI Application and Presentation layers, and it directly supports application programs.

  • Transport layer corresponds to OSI Session and Transport layers. It creates packets and reassembles messages, guarantees delivery, receives and acknowledges each packet, and sends and re-sends unacknowledged packets.
  • Network Access layer corresponds to OSI Data Link and Physical layers. This is where Ethernet, token ring and other network access protocols reside.