In the most basic Cloud Computing-service model & according to the IETF (Internet Engineering Task Force), providers of IaaS offer computers – physical or (more often) Virtual Machine-s – and other resources. (A hypervisor, such as Xen, Oracle Virtual Box, KVM, V Mware ESX/E S Xi, or Hyper-V runs the virtual machines as guests. Pools of hypervisors within the cloud operational support-system can support large numbers of virtual machines and the ability to scale services up and down according to customers' varying requirements.) IaaS clouds often offer additional resources such as a virtual-machine disk image library, raw block storage, and file or object storage, firewalls, load balancers, IP addresses, virtual local area networks (VLANs), and software bundles. IaaS-cloud providers supply these resources on-demand from their large pools installed in data centers. For wide-area connectivity, customers can use either the Internet or carrier clouds (dedicated virtual private networks). http://en.wikipedia.org/wiki/Cloud_computing#Infrastructure_as_a_service_.28IaaS.29
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