Choosing EC2 Purchase Options for Uninterruptible Bursts
A company has temporary workload that is also variable. The company needs to use Amazon EC2 instances for the workload. The EC2 instances need to handle short bursts of work that cannot stop before finishing. Which purchase option will meet these requirements?
Community Votes
100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
The core trap is confusing 'variable' workloads (which often suggest Spot Instances) with 'cannot stop' requirements, which strictly prohibit interruptions found in Spot or Savings Plans.
This question evaluates the selection of Amazon EC2 pricing models based on workload predictability and interruption tolerance. The correct answer is On-Demand Instances because they guarantee availability without interruption risks.
Candidates often select Spot Instances (A) because the workload is described as variable and temporary, failing to notice the critical constraint that instances cannot be interrupted.
Community Discussion (4 comments)
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Expert Analysis
Why the Answer Is Correct
On-Demand Instances are the only option that provides immediate capacity without long-term commitment and guarantees no interruption. Since the requirement states the workload "cannot stop before finishing," any model that allows AWS to reclaim resources (like Spot) or requires upfront payment commitments (like Savings Plans/Reserved) is unsuitable.Why the Other Options Are Wrong
Spot Instances (A) offer significant discounts but can be terminated by AWS with a two-minute warning, violating the 'cannot stop' rule. Savings Plans (C) and Reserved Instances (D) require one- or three-year commitments and are designed for steady-state, predictable workloads, not short bursts. They also do not inherently prevent termination if the instance type becomes unavailable, though this is less common than Spot termination.Community Comment Notes
The community consensus strongly supports Option B. As user AravindrajG noted, the key phrase is "short bursts of work that cannot stop before finishing," which directly points to the reliability of On-Demand Instances. Other users like ShaiTay confirmed that the inability to interrupt is the deciding factor against cheaper options.Exam Strategy
Always read the full description of the workload's constraints. If the keyword 'cannot stop', 'interruption-sensitive', or 'critical' appears, eliminate Spot Instances immediately. For short-term, unpredictable needs where cost is secondary to availability, choose On-Demand.
Frequently Asked Questions
Why are Spot Instances wrong for variable workloads here?
While Spot is good for variable workloads, it can be interrupted. The requirement 'cannot stop' makes Spot invalid.
Can Savings Plans be used for short bursts?
No, Savings Plans require long-term commitments (1-3 years) and are best for steady-state baseline usage, not short bursts.
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