The OSI versus DoD/ARPANET architecture wars, and why the messy four-layer TCP/IP stack beat the rigorous seven-layer OSI model. A look at the 1970s-80s technical and political decisions that shaped every network protocol since.
Protocols
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How TCP/IP Actually Won -
The Signal Protocol and the Double Ratchet The Signal Protocol is the most-deployed piece of cryptographic engineering in human history, sitting under Signal, WhatsApp, RCS, and Messenger. We walk what end-to-end encryption actually buys you, the X3DH initial key agreement, the symmetric and Diffie-Hellman ratchets, message ordering and out-of-order delivery, and what an attacker who compromises a device can and cannot recover.
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How Standards Bodies Actually Work The protocols you use every day were written by committees with wildly different rules, incentives, and failure modes. A tour of IETF rough consensus, IEEE 802 working groups, the ISO pay-to-read problem, the WHATWG/W3C fork, USB naming disasters, FRAND patent pools, and how an individual engineer can actually get in the room.
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CCNA: The OSI and TCP/IP Models in Practice Layer by layer from physical to application — where each protocol lives, how encapsulation actually works, and how to use the model to troubleshoot real connectivity problems rather than just pass an exam.