Answer
The truly air-gapped OT system has become a myth in today’s interconnected world. Practically all systems require a means of data transfer to remain operational e.g. for updating configuration files, patching software or performing diagnostic testing and all common means of communicating with a non-networked OT system, such as USB drives, Ethernet connection from a laptop, Wi-Fi communication or even data CD are potential attack vectors.
Even if you are convinced that your OT is secure, can you say the same for the suppliers or contractors in your supply chain?
