Cloud computing is a new model for delivering new applications and services. Its adoption is gaining ground because most of the services provided by the cloud are of low cost and readily available for use. Despite many promises by the cloud service providers, users remain much concerned about the general risk associated with the adoption of the cloud. The availability of many cloud service providers on one hand promotes competition in the cloud market and gives end users more freedom to choose the best cloud provider however it became a tedious and time consuming task for potential cloud users to evaluate and compare the available cloud offerings in the market. Hence, discovering a reliable service is a daunting task. This research proposed a trustworthy model for reliable cloud service discovery.

With the recent technological advances of wireless sensor network (WSN) and the nature of wireless sensor networks which is the power constraint, researchers face new challenges related to the design of algorithms and protocols. This work tries to survey the research that has been conducted on a number of levels to design and assess the deployment of wireless sensor networks. It highlights the current state of the Medium Access Control (MAC) protocol in WSN with a view to advance the research in the field.