What is often considered the first line of defense when setting up a network?

Physically securing the network is often regarded as the first line of defense because it addresses foundational security measures that prevent unauthorized access to physical assets and sensitive information. This step includes safeguarding the network infrastructure, such as servers, routers, switches, and other devices, by controlling who has access to them. Effective physical security measures can include locked server rooms, surveillance cameras, and access control systems that restrict entry to only authorized personnel.

By ensuring that the physical components of the network are secure, organizations significantly reduce the risk of physical tampering, theft, or destruction, which can undermine the integrity of all subsequent security measures applied to the network. In contrast, while options like firewall configuration, network intrusion detection, and data encryption are critical components of network security, they rely on a physical layer that is adequately secured to function effectively. If the physical security is compromised, all other safeguards could be rendered ineffective, highlighting the crucial role of physical security in a comprehensive network defense strategy.