Cloud computing had opened a new horizon for utilization of resources and their computing. But as accessibility of cloud increases, one of the most important factors to be considered would be availability of resources and load balancing. Fault tolerance is another issue to deal with while providing Quality of Service in cloud environment thus enhancing the performance. This paper investigates about fault-tolerance in load balancing schemes in distributed environment. There are some more parameters influencing QOS but our main focus is on fault tolerance and load balancing.

The Mobile Ad Hoc Network is an infrastructure less, multihop ad hoc network because the intermediate nodes are used to transmit data from source to destination. This paper represents the simulation based study of network protocols for varying network load and mobility. In this paper three protocols AODV, DSR and DYMO are compared by using random waypoint mobility in few nodes with varying packet sizes in CBR traffic. Different parameters or metrics are used to evaluate the performance of protocols, which are data throughput, end-to-end delay and packet loss with varying data traffic CBR(Constant Bit Ratio) load over UDP using QualNet 5.0.2 simulator.