Final answer:
The term 'defense-in-depth' describes a layered security approach that provides comprehensive protection. It involves the use of multiple security measures across different areas to guard against a variety of threats.
Step-by-step explanation:
The term that describes a layered security approach that provides comprehensive protection is defense-in-depth. This strategy involves multiple layers of security controls and mechanisms within an IT environment. Rather than relying on a single defense, this approach uses a variety of practices and technologies that can protect against a wide range of potential attacks.
By implementing defense-in-depth, organizations ensure that if one layer of security fails, the subsequent layers will continue to provide protection. Examples of layers in this approach include physical security measures, network security, application security, and user training and awareness.