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CS-723 route
Unit 2 · Lesson 3 of 4 4 min

The TCP/IP Model and Its Comparison with the OSI Model

OSI was designed in committee rooms, but a scrappier four-layer model is the one actually running the Internet.

What this unit covers

Unit 2: Network Models: OSI and TCP/IP

  1. 1 Layered Architecture and the OSI Reference ModelHow do you build something as complicated as the Internet so that nobody has to understand all of it at once? · 5 min
  2. 2 Functions of the OSI Layers at the Sender and ReceiverFloor by floor, down on the sender and up on the receiver, each layer talks only to its twin through the header it adds. · 11 min
  3. 3 The TCP/IP Model and Its Comparison with the OSI ModelOSI was designed in committee rooms, but a scrappier four-layer model is the one actually running the Internet. · 4 min
  4. 4 Network Devices and Application Layer ProtocolsA hub, a switch and a router each live on a different floor — and that decides how clever each one can be. · 8 min