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Certified Solutions Architect EC2 Instance Types and Cost Flashcards

7 cards from real AWS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A video transcoding pipeline needs instances with high vCPU counts and low memory requirements. Which EC2 family is the best fit?

    Answer: C5 compute-optimized

    C5 compute-optimized instances deliver the highest vCPU-to-memory ratio, ideal for CPU-intensive workloads like video transcoding.

  2. An EC2 T3 instance in 'standard' mode has consumed all its CPU credits. What happens to its CPU performance?

    Answer: CPU performance is throttled to the baseline level

    In standard mode, once CPU credits are exhausted, performance is throttled to the instance's baseline CPU percentage until credits regenerate.

  3. Which Savings Plans type offers the most flexibility across EC2 instance families, regions, and operating systems?

    Answer: Compute Savings Plans

    Compute Savings Plans apply automatically to any EC2 instance regardless of family, size, region, or OS, providing maximum flexibility.

  4. A genomics research firm requires instances with up to 24 TB of RAM for in-memory analysis. Which instance family should they evaluate?

    Answer: X1e instances

    X1e instances offer up to 3,904 GB of RAM, and X1 instances go even higher, making the X-family the choice for extreme memory workloads.

  5. What is the minimum commitment term for an EC2 Savings Plan?

    Answer: 1 year

    EC2 Savings Plans and Compute Savings Plans are available in 1-year or 3-year commitment terms, with 1-year being the minimum.

  6. A company runs a steady-state workload on m5.large instances in us-east-1 and wants the maximum discount on a 3-year commitment. Which payment option gives the highest discount?

    Answer: All Upfront

    All Upfront payment on a 3-year term provides the maximum discount (up to ~72% over On-Demand) because AWS receives the full commitment immediately.

  7. Which EC2 instance family is specifically optimized for network-intensive workloads requiring up to 100 Gbps of network bandwidth?

    Answer: C5n instances

    C5n instances feature up to 100 Gbps Enhanced Networking, making them ideal for network-bound HPC and data transfer workloads.