A Review of DDoS Attacks and its Countermeasures in Cloud Computing

In the present scenario, cloud computing has become a marketable technology that allows consumers to easily access resources through the internet, based on pay per use model. These resources are provided as services to the customer. Infrastructure as a Service, Platform as a Service, and Software as a Service are the 3 service models provided by the cloud. With the huge advancement in cloud computing technologies, it is widely used by many business applications, industry applications, Enterprise organizations that are committing to multi-cloud architectures, and finally, most IT expenditures are based on the cloud. However, security is the key challenge that needs more concern. According to recent studies, the most critical security concern that is confronted by cloud users is resource availability. This availability issue is mostly affected by the Distributed Denial of service attack. The Distributed Denial of service attack is an enhanced model of Denial of service. The main intention behind the Distributed Denial of Service attack is to bring down a specific service by flooding the servers and network with malformed packets which leads to the unavailability of resources to legitimate users in a cloud. Recently, cloud infrastructures also have been severely impacted by denial of service attacks. The attacker always tries to break the security at the infrastructure level as it provides the basic computing infrastructure for all cloud delivery models. This paper frames the cloud computing services and Distributed Denial of Service attack scenarios and their different defense mechanisms.