International Journal of Computer Science and Mobile Computing (IJCSMC)
Wireless sensor network is a one main issue in wireless ad-hoc sensor network is wastage of energy at each sensor nodes. Energy is the one most important factor while considering sensor nodes. Wireless sensor networks require solution for conserving energy level. One new type of attack called vampire attacks, which occurring at network layer. It leads to resource depletion (energy) at each sensor nodes, by destroying battery power of any node. It transmits a small complaint messages to disable a whole network, hence it is very difficult to detect and prevent.