Читать книгу The Official (ISC)2 CCSP CBK Reference - Leslie Fife, Aaron Kraus - Страница 13

In NIST SP 800-145, cloud computing is defined as “a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources… . that can be rapidly provisioned and released with minimal management effort or service provider interaction.”

Cloud computing is more than distributed computing or parallel computing even when done over a network (local area network or Internet). It is a philosophy that creates access to computing resources in a simple, self-driven way. If an individual has to call up the vendor and negotiate a contract for a fixed service, it is probably not cloud computing. Similarly, a company may negotiate rates and services in a cloud environment. But, the provisioning of services must not require ongoing involvement by the vendor.

Cloud computing requires a network in order to provide broad access to infrastructure, development tools, and software solutions. It requires some form of self-service to allow users to reserve and access these resources at times and in ways that are convenient to the user.

The provisioning of resources needs to be automated so that human involvement is limited. Any user should be able to access their account and procure additional resources or reduce current resource levels by themselves.

An example is Dropbox, a cloud-based file storage system. An individual creates an account, chooses the level of service they want or need, and provides payment information, and then the service and storage are immediately available. A company might negotiate contract rates more favorable than are available to the average consumer. But, once the contract is in place, the employees access this resource in much the same way as an individual user of this service.