A company has batch workloads that need to run for short periods of time on Amazon EC2. The workloads can handle interruptions and can start again from where they ended. What is the MOST cost-effectiv

Question

Options

• AReserved Instances
• BSpot Instances
• CDedicated Instances
• DOn-Demand Instances

• A
  4% (2)
• B
  82% (42)
• C
  10% (5)
• D
  4% (2)

Explanation

Spot Instances (B) are the most cost-effective choice because they allow you to bid on unused AWS EC2 capacity at discounts of up to 90% compared to On-Demand pricing - making them ideal for short-duration, interruptible batch workloads that can resume from a checkpoint if interrupted. Reserved Instances (A) require a 1- or 3-year commitment, making them cost-effective only for steady, predictable workloads - not short-term batch jobs. Dedicated Instances (C) run on hardware dedicated to a single customer for compliance/isolation needs and are significantly more expensive, not a cost-optimization tool. On-Demand Instances (D) offer flexibility with no commitment but are priced higher than Spot and are better suited for unpredictable workloads that cannot be interrupted.

Memory Tip: Think of Spot Instances as a "flash sale" on unused EC2 capacity - great when you're flexible and can tolerate being "bumped," which maps perfectly to the keywords interruptible + cost-effective in exam questions.

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