Unknown Network Use
An independent security organization recently scanned the 900 MHz bandwidth used by IoT wireless devices and found, to their client's astonishment, that the client's building HVAC (heating, ventilating, and air conditioning) was IoT-connected.
The client didn't know this, and wasn't responsible for its security. It was also identified that the HVAC devices had default passwords and very little by way of security. If a hacker had gained control of these devices, they could have caused potential business damage.
This is a good lesson learned for us all. Enterprises need to regularly, if not continuously, scan for IoT devices on their network. Enterprises ultimately need to know what is normal before they can know what isn't normal, and take remedial action as necessary.