The majority of the infrastructure of cloud computing today is a combination of reliable services delivered through data centers (data center) is built on the server with the level several of the virtualization technology. These services can be accessed from anywhere in the world, in which cloud is a single access point for all computers with customer demand. The commercial services to meet service quality requirements from customers and usually are given the service level agreement (Service Level Agreement). Open standards (Open standard) and open source software (open source software) also contribute to developing virtual server computing. Thus, before to be able to deploy an application (eg a web page) You have to buy / lease one or more servers (server), then place the server in the data center (data center), now cloud computing allows you to simplify the process of buying / leasing go. You just mentioned your request, the system will automatically pick up the free resources collected (free) to meet your requirements. Therefore, it is possible to mention a few basic benefits of cloud computing as follows: Using the computing resources (Dynamic computing resources): These resources are allocated to the enterprise as what now now want an instant. Instead of businesses must calculate whether to expand or not, how much to invest in this enterprise server, then simply ask, "Hey, cloud, we need more resources equivalent to 3.0 GHz CPU 1 , 128GB RAM ... "and the cloud will automatically search for free resources to provide for you. Reduced costs: Enterprises will be able to cut costs for purchase, installation and maintenance resources. Clearly, instead of having to appoint an expert to buy a server, server installation, server maintenance, now you do not need to do anything than to identify their exact needs and resources required. Too convenient !. Reducing complexity in the structure of the business: Enterprise producing goods that must have both an IT professional to operate, maintain servers are too costly. If this process is outsourced, enterprises will focus on the production of goods and their expertise and reduce complexity in the structure. Increasing use of computing resources: One of the questions headache of investing resources (eg servers) is how long it will be fully depreciated, I invested so profitable or not, there are outdate technology or not. When using the resources in the cloud, you do not have to care about this anymore. The model service providers cloud computing services providing their services in three basic models: Mechanical Infrastructure as a service (IaaS - Infrastructure as a Service) platform as a service (PaaS - Platform as a Service) software as a service (SaaS - Software as a Service) Which is the most basic IaaS and a higher model abstracts from the details of the model below. In 2012, the network as a Service (NAAS) and communications as a service (CAAS) has officially added by International Telecommunication Union (International Telecommunication Union) as part of the computing model cloud base, the type of service being recognized by the cloud ecosystem telecommunications. These models deploy Private Cloud (Private Cloud) Cloud General (Public Cloud) Cloud Hybrid (Hybrid cloud)
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