Commercial and Government facilities include public and private buildings that support business activities, recreational activities, commercial transactions, and many government related activities to ensure government administrative operations. General-use office buildings, military installations, courthouses, national laboratories, embassies and other structures housing critical equipment, systems and interconnected networks. Many cyber elements interact, sometimes sharing common network infrastructures. Regardless, all of the systems require and benefit from constant monitoring. Fire and safety monitoring systems, lighting and signage, heating and ventilation systems, elevators and escalators, ATMs, POS systems and a variety of other smaller systems for safety and services become business critical as soon as they are disrupted or altogether lost. Gaining visibility to the networks that link devices and these control subsystems together is essential to ensuring integrity and availability to avoid disruptions that lead to personal and business risks.