II. Cloud system models
Cloud computing is purpose to deliver a high computing resources (e.g. servers, storages, and applications) to the end users by the CSP. The cloud service providers race to offer their users best solutions and ensure the quality of service that they can provide. In a basic view, cloud computing built in three basic layers: system layer, platform layer and application layer. The first layer is the system layer, which contain the computing resources hardware such as server infrastructure, memory storages, and network devices. The system layer, the platform layer, and the application layer. It is the Infrastructure-as-a-service (IaaS). IaaS provides virtual machines that allow clients to build complex network infrastructures. This solution cut the cost for buying physical hardware for business, but also make the work much easier for the IT professional because they do not need to keep monitoring the hardware of the network.
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It work as a development platform for users to design their specific applications, and the CSP will provide tools and libraries for application development, allowing users to have control over the application deployment and configuration settings. Paas will allow developers to cut the cost by not buying software development tools.
The first layer and it is the top layer is the application layer and known as Software-as-a-Service (SaaS). In this layer, the user can use application on the cloud instead of paying to purchase these applications. SaaS if very popular among companies and professional users because of its ability to reduce cost. Table one showing CSP examples categorized on the three cloud service layers [1].
Table 1. Cloud Computing Service Providers on Cloud Service