Network Part 1 - The OSI Model as a Fault Map

Published: March 27, 2026 In a previous post, we watched a single DNS misconfiguration on one AWS server bring 3,500 companies across 60 countries to a standstill. DNS lives at Layer 7. The failure started there. This kind of thing repeats. On June 21, 2022, a misconfigured BGP route at Cloudflare blocked 50% of all global HTTP traffic. No server was overloaded. No deployment had gone wrong. Packets simply lost their way and looped endlessly through the network. This time, the failure was at Lay