Which principle of protection emphasizes the need for multiple layers of security?

The principle of protection that emphasizes the need for multiple layers of security is layering. This approach involves implementing various security measures across different layers and components of a system or environment. By having multiple defenses, if one layer is compromised, the subsequent layers still provide protection. This is akin to having several barriers in place, each designed to address specific vulnerabilities, thus creating a more robust and resilient security posture.

Layering is critical because threats can evolve, and relying on a single security measure can leave systems susceptible to breaches. By distributing protection across various layers—such as physical security, network security, and application security—organizations can enhance their overall defense against potential attacks. This multifaceted approach not only increases security but also facilitates better risk management by addressing different types of threats in a comprehensive manner.