A Nalysis of Ddos a Ttacks and S Olutions for C Loud C

-Cloud Computing makes computing real as a tool and in the form of sevices.Cloud Computing is simply defined as a type of computing that depends on sharing computing resources rather than having local servers or personal devices to handle applications. Cloud Computing is typically a metaphor for the internet. Cloud Computing, we observe an increasing need for cloud Benchmarks, In order to assess the performance of cloud infrastructures an software stacks,to assist with provisioning decisions for cloud users and to compare cloud offerings. The cloud computing model has the ability to scale computer resources on demand, and give users a number of advantages to progress their business process. In fact the total cost of going towards cloud is almost zero when resources are not in use. Therefore it is no wonder that academic research and industry are moving towards cloud computing. However, Security should in fact be implemented it alongside functionality and performance. One of the most serious threats to cloud computing security itself comes from Distributed Denial of service attacks. At virtual level DDOS (Distributed Denial of service attacks) is the biggest threat of availability in cloud computing. In Denial of service attack an attacker prevent legitimate users of service from using the desired resources by flood a network or by consuming bandwidth. An analysis on available technique to prevent the DDOS ATTACK and also the limitation of these techniques which we want to focus are DST (Dempster Shafer Theory), NIEF (Network Egress and Ingress Filtering) and various type of CAPTCHA.