Why is the concept of "defense in depth" favored in cybersecurity?

The concept of "defense in depth" is favored in cybersecurity primarily because it enhances overall security through redundancy. This approach involves implementing multiple layers of security measures throughout the IT infrastructure rather than relying on a single solution. Each layer serves as a barrier that an attacker must bypass, effectively slowing them down and providing multiple opportunities for detection and response. By diversifying security controls—such as firewalls, intrusion detection systems, antivirus software, and employee training—organizations can create a more robust defense that addresses various threats.

This redundancy is critical because vulnerabilities can exist in any single defense layer. If one layer fails or is breached, other layers can still provide protection, limiting the impact of a potential attack. This multi-layered strategy not only improves security posture but also increases the likelihood of detecting and mitigating threats before they can cause significant damage. Thus, the emphasis on redundancy and multiple defensive tactics makes this concept a foundational principle in the field of cybersecurity.