A cloud provider bills a customer monthly based on the precise number of gigabytes of storage used and the number of virtual machine hours consumed. Which essential cloud computing characteristic does this billing model demonstrate?
Measured service enables metering of resource usage and pay-as-you-go billing, as described in the scenario.
Why this answer
The billing model charges based on exact gigabytes of storage used and virtual machine hours consumed, which directly aligns with the 'measured service' characteristic. This means the cloud provider meters resource usage (e.g., storage IOPS, compute hours) and bills only for what is consumed, enabling pay-as-you-go pricing. Measured service relies on telemetry and monitoring systems (e.g., Azure Monitor, AWS CloudWatch) to track usage and generate invoices.
Exam trap
Microsoft often tests the distinction between 'measured service' (billing granularity) and 'on-demand self-service' (provisioning capability), leading candidates to confuse the ability to spin up resources instantly with how those resources are billed.
How to eliminate wrong answers
Option B is wrong because resource pooling refers to the provider's ability to serve multiple customers from shared physical resources (e.g., multi-tenancy), not how usage is billed. Option C is wrong because on-demand self-service allows users to provision resources without human interaction (e.g., via Azure Portal or CLI), but does not define the billing granularity. Option D is wrong because broad network access describes the ability to access resources over the network via standard protocols (e.g., HTTPS, SSH), not the metering or charging model.