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The “OSI Model”: There's no such thing. What they taught you is a lie
- wwarner 7y agothe original leaky abstraction
- commandersaki 7y ago> OSI wanted a "connection-oriented network layer", one that worked like the telephone system, where every switch in between the ends knows about the connection. The Internet is based on a "connectionless network layer". Pretty sure ISO/OSI was pushing for CLNP which is "connectionless network protocol."
- kjs3 7y agoSpot on. Being there at they time, the OSI folks made much of the fact that because of their well defined layers, any of the higher levels could run over a connection-oriented or connectionless without change. In theory. We never really found out for sure.
- maltalex 7y agoThere are better networking models out there [0] and at least some books use them. Including some popular ones like “Top Down Approach” by Kurose and Ross. 0: https://en.wikipedia.org/wiki/Internet_protocol_suite#Layer_names_and_number_of_layers_in_the_literature https://en.wikipedia.org/wiki/Internet_protocol_suite#Layer_...
- caseymarquis 7y agoThe thing that helped my understanding the most was opening wireshark and just observing.