Networking
2026-09-16
The OSI model, layer by layer
What each of the seven OSI layers does, how one HTTPS request gets wrapped and unwrapped on the way to a server, and why switches, routers and load balancers stop at different layers.
Networking
2026-09-26
TCP: how a connection actually works
What TCP does on top of IP: ports, the three-way handshake, sequence numbers, ACKs, retransmission, closing a connection, and the costs that pushed HTTP/3 onto QUIC.
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