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Wireless sensor network (WSN) is the vast area of research in the field of networking. A number of challenges are faced by such type of battery operated networks. In WSN, the sensors are attached to the hardware motes devices. These sensors are responsible to sense the certain events happening in the near surrounding. This sensed data is communicated with the radio/antenna attached to the sensor nodes via wireless medium. There are basically four layers discussed in WSN, namely, physical layer, MAC layer, network layer and application layer. In our paper, we discussed some recent congestion control techniques of 2013, 2014 and 2015 also.

Due to open deployment of sensor nodes in hostile environment and lack of physical shielding, sensor networks are exposed to different types of physical threats including Clone attack where an adversary physically compromises a node, extract all the credentials such as keys, identity and stored codes, make hardware replicas with the captured information and introduce them at specified positions in the network. Replica detection has become an important and challenging issue in the field of security. This paper surveys the existing schemes for clone attack detection. To conclude the paper, a comparison is shown of all the existing techniques in the literature.

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