In the modern era where the digital and virtual world is expanding itself, data storage is also becoming important. With the advancement of technology user wanted to access their data from anywhere in the world rather than carrying their actual physical drive and also they want to access their data as fast as possible. The fast access of data is done with the help of SONET and the problem of data storage was removed by the data centers and Cloud Computing. Cloud Computing represents the most efficient Information Technology (IT) standard that is used by almost every online user directly or indirectly. With cloud technology user could store and retrieve data much more easily from anywhere in the world with an active internet connection. Network-based cloud computing is rapidly going up as an alternate to orthodox office-based computing. As cloud computing becomes more common among the users, the energy consumption of the network and computing resources like hard drives server farms and data centers will grow. In this paper we will discuss about the problems that are faced for optimum resource utilisation for cloud computing and also the techniques used to overcome them.