Abstract
Most aliens who manage to get across borders undetected are known to end up in cities, and comprise some of the greatest security challenges a country can face. Safety in cities requires critical security measures that ensure that no aliens operate from across the border to avoid local enforcement. To control the border effectively, countries must deploy an effective detection system that enables real-time surveillance of border integrity. Events such as border crossings need to be monitored in real time so that any border entries can be noted by border security forces and destinations marked for apprehension. Wireless Sensor Networks (WSNs) are ideal for national and city border security because they enable enforcement teams to monitor events in the physical environment. Using the OPNET to simulate a WSN will make the WSN nodes robust and efficient by optimizing geographical coordination and network design.