What does the concept of "defense in depth" entail?

The concept of "defense in depth" entails implementing multiple layers of security controls to protect assets. This strategy is designed to provide redundancy and ensure that if one layer of security fails, others will still be in place to mitigate risks and protect sensitive information. By incorporating various types of security measures such as physical security, firewalls, intrusion detection systems, and user training, organizations can create a more robust security posture.

This layered approach is vital because it recognizes that no single security control is foolproof; therefore, multiple overlapping defenses are necessary to address potential vulnerabilities and threats. Such an approach not only enhances protection but also complicates potential attacks, as an adversary would need to bypass several different security mechanisms rather than overcoming just one. This is why implementing multiple layers of security is central to an effective overall security strategy.