The OSI Model

Understanding the 7 layers of networking from Physical to Application.

The 7 Layers of Hell (and Heaven)

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"Please Do Not Throw Sausage Pizza Away" - The mnemonic to remember the layers.

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L7 < span class="text-white w-32" > Application < span class="text-xs text-zinc-500" > HTTP, DNS, SMTP(User interaction)

< div class="flex items-center gap-4 bg-zinc-900 p-2 rounded border-l-4 border-purple-500" > L6 < span class="text-white w-32" > Presentation < span class="text-xs text-zinc-500" > Encryption(TLS), JSON / XML formatting

< div class="flex items-center gap-4 bg-zinc-900 p-2 rounded border-l-4 border-purple-500" > L5 < span class="text-white w-32" > Session < span class="text-xs text-zinc-500" > Sockets, maintaining connections

< div class="flex items-center gap-4 bg-zinc-900 p-2 rounded border-l-4 border-blue-500" > L4 < span class="text-white w-32" > Transport < span class="text-xs text-zinc-500" > TCP / UDP(Ports)

< div class="flex items-center gap-4 bg-zinc-900 p-2 rounded border-l-4 border-green-500" > L3 < span class="text-white w-32" > Network < span class="text-xs text-zinc-500" > IP Addresses(Routers)

< div class="flex items-center gap-4 bg-zinc-900 p-2 rounded border-l-4 border-yellow-500" > L2 < span class="text-white w-32" > Data Link < span class="text-xs text-zinc-500" > MAC Addresses(Switches) < div class="flex items-center gap-4 bg-zinc-900 p-2 rounded border-l-4 border-red-500" > L1 < span class="text-white w-32" > Physical < span class="text-xs text-zinc-500" > Cables, Fiber, WiFi signals