What is identified as the first line of defense against intruders?

The perimeter is identified as the first line of defense against intruders because it encompasses the physical boundaries of a property or facility, effectively establishing a barrier that deters unauthorized access. By securing the perimeter, organizations can limit the opportunities for an intruder to approach the main entrances or other vulnerable points of entry. Various measures, such as fencing, gates, and signage, can reinforce the effectiveness of the perimeter, making it more difficult for would-be intruders to breach security.

While security personnel, surveillance cameras, and the main entrance are all important components of a comprehensive security strategy, they operate after the perimeter has been established. Security personnel can monitor for intrusions and intervene, surveillance cameras provide surveillance of activities, and the main entrance is a controlled access point, but if the perimeter is not effectively secured, these measures may be rendered less effective. Therefore, focusing on the perimeter is crucial for preventing unauthorized access right from the start.