Final answer:
In the field of IT security, defense in depth refers to layering multiple security controls to provide a strong defense against cyber threats.
Step-by-step explanation:
In the field of IT security, defense in depth refers to the practice of layering multiple security controls to provide a strong and comprehensive defense against cyber threats. This approach ensures that even if one control fails or is bypassed, there are other layers of defense to prevent unauthorized access or data breaches.
For example, an organization may implement firewalls, intrusion detection systems, encryption, and access controls to protect their networks and systems. Each control adds an extra layer of security, making it more challenging for attackers to infiltrate the network.
Defense in depth is essential because it minimizes the chances of a single point of failure compromising the entire system. It also allows organizations to adapt and respond to evolving threats by deploying different controls at various layers.