https://www.rafaelvzago.com/en/tags/arpanet/Recent content in Arpanet on Rafael ZagoHugoen-US© Rafael ZagoFri, 24 Jul 2026 16:16:10 -0300https://www.rafaelvzago.com/en/posts/protocolos-tcp-ip-o-inicio/Sat, 14 Dec 2024 00:00:00 -0300https://www.rafaelvzago.com/en/posts/protocolos-tcp-ip-o-inicio/<p><a href="https://www.rafaelvzago.com/assets/img/headers/tcpip-protocols-hero.webp" class="img-lightbox" data-lightbox> <img src="https://www.rafaelvzago.com/assets/img/headers/tcpip-protocols-hero.webp" alt="" loading="lazy" decoding="async"> </a></p> <h2 id="tcpip-protocols-a-complete-introduction">TCP/IP protocols: a complete introduction</h2> <h2 id="arpanet-and-the-origins-of-tcpip">ARPANET and the origins of TCP/IP</h2> <p>The story of TCP/IP starts in the late 1950s, at the height of the Cold War. The U.S. Department of Defense (DoD) wanted a command-and-control network that could survive a nuclear attack. Military communications at the time relied on the public telephone network, which looked fragile: rigid hierarchy, little redundancy.</p> <h3 id="early-research-and-paul-barans-contributions">Early research and Paul Baran&rsquo;s contributions</h3> <p>Around 1960, the DoD hired the RAND Corporation to look for a solution. Paul Baran proposed a highly fault-tolerant distributed design that used digital packet switching instead of analog signals. Large carriers like AT&amp;T resisted at first, but Baran&rsquo;s idea laid the groundwork for modern resilient networks.</p>