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Dec 18, 2020 at 2:56 comment added Jeff Learman Interesting to hear that x.400 might still be alive. I thought it was the last to die (with only X.5xx and ISIS remaining.)
Dec 18, 2020 at 2:54 comment added Jeff Learman For the lower 4 layers, it definitely helps to understand the OSI model, or the IP services model (which are similar enough at the academic level.) But I wish teachers would focus more on services than on layers. The layers are just the big map simple case. Once you understand that, then you look at all the interesting exceptions, based on services provided and services used.
Jun 13, 2019 at 11:20 review First posts
Jun 13, 2019 at 23:35
Jun 12, 2019 at 13:00 review Late answers
Jun 12, 2019 at 13:54
Jun 12, 2019 at 12:42 history answered TabTwo CC BY-SA 4.0