1. If there is any layer that is actually between layer 4 (like TCP) and layer 7 (like HTTP or SMTP) ... *surely* it is TLS. But that's not a layer in the OSI model.
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2. To double down on (1) ... have you *ever* seen layers 5 or 6 referred to? know what they are without looking? exactly? (also layers 5 and 6 make no real sense in a modern world).
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3. In reality all sorts of "lower level" dependencies that the lower layers need like DNS, ARP, DHCP, PKI in fact run over much higher level layers. Neat layering is a lie!
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4. Layers 1 and 2 and 3 are really like ... 6 or more intertwined layers. There's quite a lot between an IP or a MAC address and photons or electrons. Like just these 5 'hidden' layers: SDN, VLANs, MPLS, DWDM, OTN encryption are super common in today's world.
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End of conversation
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Padlipsky's rule! If you know what you're doing, three layers is enough; if you don't, even seventeen levels won't help.
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