Security is the prime issue in Networks, cloud computing and Big Data Analytics where targeted attacks are the most hazardous, among them advanced persistent threat is precisely defined as a significant challenger that possesses sophisticated levels of proficiency and momentous resources which permits to create prospects to achieve goals. The key goal is to discuss different strategies, procedures, policies and process regarding Défense approach and design to a new strategy and implements the best Défense approach that is the onion layered security system for protection of cloud from intrusions, vulnerabilities, risks, threats and attacks. We discussed different social engineering techniques implemented for Defense modeling to get the targeted attack that identifies, studies, categorizes, detects and validates the threats. We even discussed advances in onion routing in network based cloud architecture which leads the concept of Defense in depth. We evaluated the role of intrusion detection system, firewalls, security incident and event management technologies, log files monitoring and vulnerability assessments. Finally, the concept of layered security is proved mathematically and practically where analysis is given along with the result.
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