Question #1371
Which scenario best aligns with the optimal use of Amazon EC2 On-Demand Instances?
A consistent and continuous workload requiring dedicated EC2 capacity for over six months
A fault-tolerant application that can prioritize cost savings over immediate availability
A variable workload with sporadic bursts that cannot tolerate reserved capacity commitments
A long-running enterprise application with predictable resource utilization for 18 months
Explanation
Option C is correct because:
- On-Demand Instances are designed for workloads with unpredictable usage patterns and no need for long-term commitments. They allow users to pay for compute capacity by the hour/second without upfront costs.
- Variable/sporadic workloads (e.g., sudden traffic spikes) benefit from On-Demand's flexibility, as scaling can be done dynamically without reserved capacity constraints.
- Why other options are incorrect:
- A: A 6+ month consistent workload aligns better with Reserved Instances (lower costs with commitment).
- B: A fault-tolerant app prioritizing cost savings suits Spot Instances (interruptible, cheaper than On-Demand).
- D: A predictable 18-month workload also favors Reserved Instances for cost efficiency.
Key Takeaway: On-Demand is ideal for short-term, irregular, or experimental workloads where capacity requirements are uncertain.
Answer
The correct answer is: C