Certified Information Systems Security Professional (CISSP) Practice Exam

The concept of Defense in Depth refers to the strategy of applying multiple safeguards across various domains to protect information and systems. This approach recognizes that no single security measure can be completely foolproof against all potential threats. By layering different types of security controls—such as physical security, technical security, administrative policies, and training—an organization can create a more resilient security posture.

This strategy enhances security by ensuring that if one layer of defense is breached, additional layers remain to protect critical assets. For example, the combination of firewalls, intrusion detection systems, antivirus software, and employee training all provide distinct protective functions that work synergistically to mitigate risks. Thus, the multiple layers work collaboratively to provide a stronger defense against various types of attacks.

In contrast, a singular security measure that is complex may not effectively address vulnerabilities across different aspects of security. A minimalistic approach to security may result in insufficient protection, and focusing solely on network perimeters overlooks the necessity of securing internal systems and data as well. Therefore, using multiple safeguards across various domains is integral to a robust security framework.