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Multi-cloud concept has broaden the world of cloud computing and has become abuzzword today. The word Multi-cloud envisions utilization of services frommultiple heterogeneous cloud providers via a single architecture at customerpremises. Though cloud computing has many issues and offers open researchchallenges, still the academics and industrial research has paved a pathway formulti-cloud environment. The concept of multi-cloud is in maturing phase, andmany research projects are in progress to provide a multi-cloud architecturewhich is successfully enabled in all the respects like easy configuration,security, management etc. In this paper, concepts, challenges, requirement andfuture directions for multi-cloud environment are discussed. A survey ofexisting approaches and solutions provided by different multi-cloudarchitectures is entailed along with analysis of the pros and cons of differentarchitectures while comparing the same.

A Survey and Comparative Study on Multi-Cloud Architectures: Emerging Issues And Challenges For Cloud Federation