Question 1

What EC2 purchasing option provides the largest discount (up to 90%) but can be interrupted by AWS with a 2-minute warning?

Accepted Answer

Spot Instances. AWS can reclaim them when capacity is needed, making them ideal for fault-tolerant, flexible workloads like batch processing.

Question 2

Which EC2 Reserved Instance payment option provides the greatest discount compared to On-Demand pricing?

Accepted Answer

All Upfront. Paying the entire reservation cost upfront yields the highest discount over the 1- or 3-year term.

Question 3

What is the key difference between a Convertible Reserved Instance and a Standard Reserved Instance?

Accepted Answer

Convertible RIs allow you to change the instance family, OS, tenancy, and size during the term, while Standard RIs do not. Convertible RIs offer a smaller discount in exchange for this flexibility.

Question 4

Which EC2 instance type is optimized for workloads requiring high memory-to-vCPU ratios, such as in-memory databases like SAP HANA?

Accepted Answer

Memory-Optimized instances (R-family, e.g., r6g, r5). They provide large amounts of RAM for in-memory processing workloads.

Question 5

What is a Dedicated Host in EC2, and when would you choose it over a Dedicated Instance?

Accepted Answer

A Dedicated Host is a physical server fully allocated to your use, giving you visibility into physical cores and sockets. Choose it when you need to use existing per-socket or per-core software licenses (BYOL).

EC2 & Compute – AWS Solutions Architect Associate

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