High Availability and Disaster Recovery and Auto-Scaling and a design in place to avoid SPOF (Single Point of Failure) always ignore Network being a SPOF. But, Network can be a Single Point of Failure too.
Network is not a SPOF. Poorly implemented network can be though. My team manages a global network. We run outage simulations quarterly ( to check for unintended consequences of changes ).<p>Part of that process is to down all circuits and services from a vendor.<p>Could vendors be sharing upstream Concentrations that create SPOF. Sure they could. That’s why we contract a single vendor to create truly diverse services.<p>We see 100x outages and failures from craplications vs network.