What is cybersecurity architecture designed around a perimeter called?

Cybersecurity architecture designed around a perimeter is referred to as system-centric. This approach focuses on securing entire systems or networks as a whole, creating defenses built around the organization's perimeter, such as firewalls and intrusion detection systems. The primary goal is to establish a barrier that prevents unauthorized access while controlling the flow of legitimate traffic.

In a system-centric architecture, security measures are implemented at the network level to protect resources and data from external threats. This type of architecture emerged from older models that recognized the importance of perimeter defenses before encompassing more holistic approaches. It focuses on safeguarding the system as a single entity, rather than prioritizing data integrity, user identity, or specific applications independently, which are aspects of data-centric, user-centric, and application-centric architectures, respectively. These other perspectives emphasize securing specific elements rather than the entire system as a cohesive unit.