4/28/2018 Cloud Compuuting Services ModelsThe services models of cloud computing are Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software-as-a-Service (SaaS). Cloud computing also is divided into five layers including clients, applications, platform, infrastructure and servers. The five layers look like more reasonable and clearer than the three categories. The clouds are a large pool of virtualized resources which are ease to use and access. There are ten characteristics of cloud computing in their sum-up: user friendliness, virtualization, Internet centric, variety of resources, automatic adaptation, scalability, resource optimization, pay-per-use, service SLAs (Service-Level Agreements), infrastructure SLAs and the most important characteristics are TCP/IP based, virtualization and high security. TCP/IP gives reliable delivery, a connection-oriented service between remote applications. TCP/IP is widely used in cloud computing. Although the network protocols may be private in the back end of data center, most cloud users connect through TCP/IP.
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