People also assume just because the management network is isolated, that attackers can't get to it. The Snodwen leaks showed us that NSA uses radio transmitters

People also assume just because the management network is isolated, that attackers can't get to it. The Snodwen leaks showed us that NSA uses radio transmitters to jump to hosts that relay packets to and from the network. Someone with the sophistication to drop a chip onto a motherboard during manufacturing (which I don't doubt) and get it to the right customer could most likely slip a more advanced implant to bridge networks into a workstation headed to the NOC.