CLF-C02 Billing, Pricing, and Support Practice Question

Answer analysis

Option-by-option breakdown

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

• ✗

  On-Demand Instances

  Why it's wrong here

  On-Demand Instances charge per second (with a 60-second minimum) and require no upfront commitment or termination notice, providing maximum flexibility for short-lived or spiky workloads. However, that convenience comes at the highest list price per compute hour, so a production workload running 24/7 would accumulate unnecessarily high costs over a one- or three-year equivalently. The pricing model is therefore not aligned with minimizing cost for predictable, continuous usage.

  When this WOULD be correct

  A company with unpredictable, short-term workloads that cannot be interrupted and require no upfront commitment should choose On-Demand Instances. For example, a startup running a new application with unknown traffic patterns.

• ✓

  Reserved Instances

  Why this is correct

  Reserved Instances are a billing discount applied to matching instance attributes after you commit to a one- or three-year term, offering up to 72% savings over On-Demand. For a production workload running continuously, that steady utilization profile makes RIs the most cost-effective option without sacrificing availability. Standard RIs lock in a fixed instance family and Region, while Convertible RIs allow changing attributes, but both preserve your running instance capacity.

• ✗

  Spot Instances

  Why it's wrong here

  Spot Instances offer spare EC2 capacity at discounts of up to 90%, but AWS can reclaim that capacity with only a two-minute notice because the capacity is auctioned per Availability Zone. That interruptibility makes them unsuitable for a production workload that must run continuously and cannot tolerate termination. They are best reserved for stateless, fault-tolerant, or interruptible batch jobs.

  When this WOULD be correct

  A company runs a batch processing job that is fault-tolerant and can be interrupted. The job has flexible start and end times, and the company wants the lowest possible compute cost.

• ✗

  Dedicated Hosts

  Why it's wrong here

  Dedicated Hosts deliver a physical server that is fully dedicated to your use, with Amazon EBS and networking shared, primarily for meeting specific server-bound software licenses, compliance requirements, or directing instance placement. They are billed per host rather than per instance, and a dedicated host typically costs more than On-Demand instances occupying the same capacity; the service provides no inherent discount. Using them solely for cost reduction would increase expenses, not minimize them.

  When this WOULD be correct

  A company has compliance or licensing requirements that mandate dedicated physical servers (e.g., for software licensing tied to specific sockets or cores). The question would specify that the workload must run on a dedicated physical host due to regulatory or contractual obligations.

Option-by-option analysis

Why each answer is right or wrong

Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.

Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”

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