A company uses Amazon EC2 instances to run its application. The application needs to be available and running continuously for three or more years. What type of EC2 instance should the company purchas

Question

Options

• AReserved Instances
• BSpot Instances
• COn-Demand Instances
• DEC2 Fleet

• A
  86% (30)
• B
  3% (1)
• C
  6% (2)
• D
  6% (2)

Explanation

Reserved Instances are the ideal choice when a workload requires continuous, long-term usage (1 or 3 years), offering discounts of up to 72% compared to On-Demand pricing in exchange for a usage commitment - perfectly matching the 3+ year requirement in this scenario.

Why the distractors are wrong:

• B. Spot Instances are meant for flexible, interruption-tolerant workloads and can be terminated by AWS with little notice, making them unsuitable for continuously running applications.
• C. On-Demand Instances offer no upfront commitment or discount - you pay full price per hour, which is more expensive for long-term, predictable workloads.
• D. EC2 Fleet is a feature that lets you provision a combination of instance types across purchasing options, but is not itself a pricing model that provides discounts.

Memory Tip: Think of Reserved Instances like signing a long-term apartment lease - you commit upfront for 1 or 3 years and get a significant discount in return. If you need to run something continuously and predictably, "reserve" your spot and save money!

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