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CLF-044
Which of the following best describes an advantage of the cloud compared with an on-premises environment?
Choices
Explanation and answer
Read the explanation and correct answer (spoiler — try answering first)
Correct answer: B. You can scale resources up and down based on demand
Explanation
In the cloud, you can add resources when you need them and reduce them when you don't. This makes it easier to respond to changes in demand and reduce upfront investment.
Per-choice explanations
A. You must always purchase physical servers in-house
In the cloud, you do not need to purchase physical servers in-house.
B. You can scale resources up and down based on demand
Correct. Scalability and elasticity are representative advantages of the cloud.
C. All security configuration becomes unnecessary
Security configuration is still required. You need to understand the shared responsibility model.
D. All services are always free to use
AWS has a free tier, but not all services are always free.
Practical Use
Representative advantages of cloud computing are the ability to scale resources up and down based on demand, that is, scalability and elasticity. In an on-premises environment, servers must be prepared in advance based on expected peak access, leaving any surplus servers as fixed cost during normal periods. In the cloud, Auto Scaling, Elastic Load Balancing, and serverless architectures (such as AWS Lambda) automatically increase or decrease resource volume according to demand, and combining this with pay-as-you-go billing reduces waste. On the exam, the advantage of the cloud compared with on-premises is asked as the choice that says you can scale resources up and down based on demand. Common distractors include statements that clearly contradict the definition of the cloud, such as "you must always purchase physical servers in-house" (which describes on-premises), "all security configuration becomes unnecessary" (which contradicts the shared responsibility model), and "all services are always free to use" (which misreads the free tier). Choices that contain absolute words such as "always" and "all" are likely to be incorrect. In practice, the criterion for selection is whether elasticity helps a given workload. Auto Scaling and serverless work well for websites, campaigns, and batch processing with large demand variation. For workloads with constantly stable load, however, long-term commitment discounts such as Reserved Instances and Savings Plans bring down the unit price more than on-demand pricing. CLF-C02 expects the precise definition that the cloud "reduces waste in response to demand," rather than the oversimplification that "cloud is always cheap." The four keywords scalability, elasticity, agility, and pay-as-you-go are repeatedly asked as "advantages of the cloud."