Cloud computing has become one of the most demanding services over the internet. It has gained remarkable fame for past few years.But it is under the severe threats of internet security. One of the severe threats is Distributed Denial of Service (DDoS). DDoS occurs when a huge amount of packets are sent to a server from various computers. Botnet is one of the major causes that launch DDoS attack. Botnet is actually a network of bots or zombie computers that are under the control of attacker. Several techniques are available in the literature that provides solution to avoid DDoS attack.A survey on DDoS detection and prevention techniques and their comparative analysishave been done in this paper.
Cloud computing provides easy access and high performance computing on the data. Other major challenge faced by software companies is storage of data at affordable cost and makes available all the time. For both the consumers and the business customers cloud storage is a major repository. Perceptible means of contest is pricing but the difficulty of pricing plans may make a judgment difficult. In this paper the major cloud service providing companies are selected and their pricing plan is surveyed and compared them using the unit price as the means of comparison.The pricing plan is compared by point wise for value of storage volume and an overall comparison is made by Paretodominance criteria. Under both approaches, most providers appear to offer pricing plans that are more costly and can be expelled from a procurement selection in favor of a limited number of dominant service providers.
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