A Wireless Sensor Network (WSN) consists of a group of sensors which are geographically distributed and are capable of computing, communicating and sensing. One of the major challenges of WSN is to preserve energy. MAC protocols which operate at the data link layer have full control over the wireless radio; their design can contribute significantly to the overall energy requirements of a sensor node. The goal of the sensor MAC (S-MAC) protocol (Ye et al. 2002) is to reduce unnecessary energy consumption, while providing good scalability and collision avoidance. S-MAC adopts a duty-cycle approach, that is, nodes periodically transition between a listen state and a sleep state. The sleep deprivation torture attack also known as denial-of-sleep attack is a powerful attack in which an attacker prevents a sensor from going into sleep mode. It makes a device inoperable by draining the battery more quickly than it would be under normal usage. This paper provides a comparative study of 802.11 and SMAC protocol under this attack. A simulation has been carried out in NS2 and analysis shows that SMAC performs similar to 802.11 under such attack.

Wireless Sensor Networks ( WSN’S) , Media Access Control(MAC) , Sensor MAC (SMAC)

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