Google “network access control” (NAC) and you’ll see about a half-million references. Add “multi-tenant” and 95% of them disappear. Repeat with terms like “network management” and ITOM and the pattern repeats — add multitenancy to the search, and just 2% of the references remain. You might think multi-tenant NAC and ITOM don’t yet perform in the real world. But they do, and in large, high-stakes applications. One example: for years, more than half of all savings banks in Germany have met rigorous banking security requirements by subscribing to a single provider of cloud-based, multi-tenant NAC-as-a-Service (NACaaS).