Cloud Digital Leader Practice Question: Which TWO of the following are key…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

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  Virtualization

  Why it's wrong here

  Virtualization is an enabling technology that abstracts physical hardware into logical resources, enabling multiple operating systems to run on a single host. However, the NIST definition of cloud computing does not include virtualization as one of the five essential characteristics; it is a foundational implementation detail that makes cloud delivery possible rather than a defining attribute. A cloud service could theoretically run on bare metal and still satisfy NIST's essential characteristics, so virtualization is not a requirement.

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  Multi-tenancy

  Why it's wrong here

  Multi-tenancy refers to a shared infrastructure or software instance serving multiple customers or tenants, commonly used to improve utilization and reduce costs in public clouds. While it is a frequent architectural pattern and can support the NIST characteristic of resource pooling, it is not itself one of the five essential characteristics of cloud computing. NIST's definition does not mandate that resources be shared among tenants; a single-tenant cloud can still be a valid cloud, making multi-tenancy an optional design choice rather than a defining trait.

• ✓

  Measured service

  Why this is correct

  Measured service is one of NIST's five essential characteristics of cloud computing, requiring that cloud systems automatically control and optimize resource use by leveraging a metering capability at some level of abstraction appropriate to the service type (e.g., storage, processing, bandwidth, or active user accounts). This metering provides transparency for both the provider and consumer, enabling pay-per-use billing, capacity planning, and monitoring of usage against service-level agreements. It fundamentally differentiates cloud computing from traditional IT by transforming fixed infrastructure costs into variable costs tied directly to consumption.

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  Serverless computing

  Why it's wrong here

  Serverless computing is a high-level execution model, such as functions-as-a-service (FaaS), where the cloud provider manages server allocation and automatically scales resources in response to event triggers. It is a service model built atop cloud infrastructure, not one of NIST's defining characteristics of cloud computing. Serverless actually depends on essential characteristics like measured service and rapid elasticity to operate, but the NIST definition describes the general nature of cloud, not specific implementation paradigms or deployment options.

• ✓

  Rapid elasticity

  Why this is correct

  Rapid elasticity is a NIST essential characteristic, meaning that capabilities can be elastically provisioned and released, in some cases automatically, to scale rapidly outward and inward commensurate with demand. To the consumer, the available capabilities often appear unlimited and can be purchased in any quantity at any time, eliminating the need for capacity planning for peak loads. This bidirectional scaling distinguishes cloud from traditional infrastructure where provisioning takes days or weeks, and it is central to handling variable or unpredictable workloads.

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