350-601 Exam Dumps : Implementing Cisco Data Center Core Technologies v1.1 (350-601 DCCOR)

NIST Special Publication 800-145 defines on-demand self-service as one of the five essential characteristics of cloud computing. It allows a consumer to provision computing capabilities, such as server processing and storage, automatically and as needed without requiring direct human interaction with each service provider. Cloud computing also includes broad network access, resource pooling, rapid elasticity, and measured service. Option A is incorrect because the NIST model does not require decentralized management; cloud resources are commonly centrally managed and automated. Option C contradicts the essential characteristic of resource pooling, in which provider resources serve multiple consumers dynamically. Option D is also incorrect because cloud computing emphasizes rapid elasticity and the ability to scale capabilities according to demand, rather than providing a permanently fixed amount of computing capacity.