List and describe the four categories of locks. In which situation is each type of lock
7. What are the two possible modes of locks when they fail? What implications do these
modes have for human safety? In which situation is each preferred?
8. What is a mantrap? When should it be used?
9. What is the most common form of alarm? What does it detect? What types of sensors
are commonly used in this type of alarm system?
10. Describe a physical firewall that is used in buildings. List reasons that an organization
might need a firewall for physical security controls.
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