Which of the following devices requires physical protection in an ICS?

Controllers and Remote Terminal Units (RTUs) are critical components in an Industrial Control System (ICS) as they are directly responsible for managing and controlling industrial processes and equipment. These devices often operate in environments that are physically accessible, making them susceptible to various types of threats such as tampering or unauthorized access.

Physical protection is essential for controllers and RTUs because any unauthorized manipulation can lead to significant operational disruptions, safety hazards, or even catastrophic failures in critical infrastructure. Proper physical safeguards, such as secure enclosures, access control measures, and surveillance, are necessary to prevent individuals from physically interacting with these devices.

While other devices such as wireless routers, data servers, and workstations also require security, the critical nature and specific function of controllers and RTUs in controlling hazardous industrial processes necessitate a heightened level of physical security to ensure safe and reliable operations. Safeguarding these devices protects not only the integrity of the system but also the safety of personnel and the environment.