Wireless Sensor Networks have come to the forefront of the scientific community recently. Present WSNs typically communicate directly with a centralized controller or satellite. Going on the other hand, a smart WSN consists of a number of sensors spread across a geographical area; each sensor has wireless communication ability and sufficient intelligence for signal processing and networking of the data. This paper surveyed the different types of attacks, security related issues, and it's Countermeasures with the complete comparison between Layer based Attacks in Wireless Sensor Networks
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