[preseinger]

how do you know your network is trusted and/or private?

trick question: you can't

even the network links between hosts in a single rack in a DC can be vulnerable

[mgaunard]

I own the machines, the switches, the routers and the cables.

[cratermoon]

And you're certain that no one will ever access your network negligently or with malicious intent?

[preseinger]

where does all of that hardware live?

unless it's in your home, it's not trustable