Maybe you don't want to place that solely on the shoulders of the network admin. These days most network data is encrypted, so the network admin cannot do much.

Maybe you don't want to place that solely on the shoulders of the network admin. These days most network data is encrypted, so the network admin cannot do much. So either the host must be trusted to conform to policy. In which case it up to the host admin to avoid bad setups, or the host should have no (direct) access to the internet.