Re:Visa Plans to Enable Bitcoin Payments at 70M Merchants
by quesera on Wednesday March 17, 2021 @10:03PM
(#26499037)
Yep, and TCP is L4. So TCP/IP is L4/L3.
The usual criticism of the OSI model is that there are grey areas and dependencies, where a lower layers bleed into higher layers (e.g. L2 switching which can work a lot like routing in modern hardware), and higher layers that are tightly bound to lower layers, making the distinctions unclear.
The purist in me wants to agree, but I think the model is too useful to disregard casually.
The value comes from the abstraction, and like Newtonian physics, it is a great model -- until it isn't.
The usual criticism of the OSI model is that there are grey areas and dependencies, where a lower layers bleed into higher layers (e.g. L2 switching which can work a lot like routing in modern hardware), and higher layers that are tightly bound to lower layers, making the distinctions unclear.
The purist in me wants to agree, but I think the model is too useful to disregard casually.
The value comes from the abstraction, and like Newtonian physics, it is a great model -- until it isn't.