Sensor networking is an emerging technology that promises an
unprecedented ability to monitor the physical world via a spatially
distributed network of small and inexpensive wireless sensor nodes.
The nodes can measure the physical environment with a wide variety of
sensors, including acoustic, seismic, thermal, and infrared. While the
practically unlimited range of applications of sensor networks is
quite evident, our current understanding of their design and
management is far from complete. Because sensor networks collect data