physical security dangers faced by SCADA (supervisory control and data acquisition) network systems.

1. Using three different industries, provide three examples of physical security dangers faced by SCADA (supervisory control and data acquisition) network systems.

2. After reviewing Presidential Policy Directive 21 (PPD-21), discuss a national policy to strengthen and maintain secure, functioning, and resilient critical infrastructure. What is resilient infrastructure? Provide two examples of how this concept protects people and property.