An Efficient Approach of Network Intrusion Detection and Countermeasure Selection in Virtual Network Systems

: Intrusion Detection and Prevention Systems (IDPS) are used: to identify possible attacks, collecting information about them and the trying to stop their occurrence and at last reporting them to the system administrator. These systems are used by some organizations to detect the weaknesses in their security policies, documenting existing attacks and threats and preventing an individual from violating security policies. Because of their advantages these systems became an important part of the security infrastructure in nearly every organization. In a Cloud computing environment, attackers can determine the vulnerabilities in the cloud systems and compromise the virtual machines to set out large scale Distributed Denial-of-Service (DDOS) attack. To avert these virtual machines from concession, we propose a multi-phase solution E-NICE (An Efficient Network Intrusion Detection and Countermeasure selection in Virtual Network Systems using defense in depth frame work).