Network security in mobile Adhoc network is major issue. MANET system efficiency and security is compromised to create instability, disrupt network performance reducing fault tolerance, capability and attack on confidentiality, integrity and availably of information in network .the attack on adhoc is launched mainly in network layer to reducing Trust ship of system. Open nature communication makes wireless connection prone for various security threats. This paper consist a brief review of mobile ad-hoc network along with effect and vulnerabilities into same. It also enlists and explores the challenges to derive new mechanism over security threats. Subsequently, a compressive study has performed on Sybil Attack and its effect on ad-hoc networks. Work also consider some existing solution mitigate Sybil attack.
Sensor networks are currently used in wide spread deployment, so security issues are also a large concern in Sensor Networks, or Sensor Node Networks. Gray Hole attack is very much deleterious attack against the sensor node networks, and makes the whole networks malfunctioning, and also affects the whole sensor networks communication.In this paper I have described different defense intrigue according to my knowledge, and also as per different research papers studied. As per my knowledge, I have described drawbacks of Gray Hole Attack, or Selective Forwarding Attack, thus providing better way to understand the Gray Hole Attack in better way and the proposed solution. In the proposed solutions, I have tried to give better solutions in the sense of detection and prevention of Gray Hole Attack or Selective Forwarding attack.
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