What is the main goal of implementing Defense-in-Depth?

The main goal of implementing Defense-in-Depth is to protect all layers of the OSI Model. This layered approach to security involves using multiple security measures across various layers of an organization’s infrastructure to create a comprehensive defense, which makes it more challenging for attackers to penetrate the system. By securing each layer, from physical security to application security, organizations can ensure that if one layer is compromised, there are additional layers of protection in place to mitigate the impact and prevent unauthorized access.

This strategy recognizes that no single security control is sufficient on its own, and by distributing security measures across different layers, organizations can provide a more robust defense against various threats, whether these come from network-based attacks, application vulnerabilities, or even physical breaches. Therefore, the emphasis on protecting all layers within the OSI Model aligns with the purpose of creating a multifaceted defense strategy that enhances overall security posture.