What does "boundary defense" refer to in cybersecurity?

"Boundary defense" in cybersecurity specifically refers to the strategies and methods used to secure the network perimeters from unauthorized access and cyber threats. This includes deploying firewalls, intrusion detection systems, and other security technologies and protocols that provide a protective barrier between the internal network and external threats. By focusing on the network's boundary, organizations aim to minimize the risk posed by external attacks, thereby safeguarding sensitive data and ensuring the integrity of their systems.

The other options, while related to cybersecurity, do not precisely define boundary defense. Protecting internal users pertains to user access control and security within the network, which is a different focus. Training users on security practices is vital for fostering a security-aware culture, but it does not directly involve boundary defense measures. Implementing physical security measures is also critical for protecting hardware and sensitive data, but it addresses a different aspect of cybersecurity, focusing more on the physical environment rather than the digital network perimeter.