Five Essential Characteristics of Cloud Computing
The following five characteristics, as defined by NIST, are considered inherent in cloud computing services:
- On-Demand Self-Service: Customers can automatically provision computing capabilities and resources on their own when needed without necessitating any human intervention.
- Broad Network Access: Access and capabilities are available over the network through standard devices, such as cell phones, laptops, PDAs, etc.
- Resource Pooling: Resources such as network bandwidth, virtual machines, memory, processing power, storage capacity, etc. are pooled together to serve multiple customers using a multi-tenant model. That is, virtual and physical resources are dynamically assigned and reassigned based on need and customers’ demands.
- Rapid Elasticity: Depending on demand, resources and capabilities can be quickly and automatically deployed and scaled at any quantity and at any time.
- Measured Service: Customer usage of the vendor’s resources and services are automatically monitored, controlled and reported offering a high level of transparency for the customer and vendor.
It is possible that some vendors claim cloud computing as a service, but fail to provide one or more of the essential characteristics as listed above. For example, cloud computing vendors which fail to provide transparency (e.g. a detailed report of consumption per service) of your services consumed are not offering true cloud computing services.
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