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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 machine learning team needs GPU-accelerated instances for training deep learning models. Which EC2 instance family is purpose-built for this use case?

    Answer: P-family instances

    P-family instances (P3, P4) are equipped with NVIDIA GPUs specifically designed for ML training and HPC workloads.

  2. A startup wants to run fault-tolerant batch processing jobs at the lowest possible cost, and the jobs can be interrupted. Which EC2 purchasing option should they use?

    Answer: Spot Instances

    Spot Instances offer up to 90% savings over On-Demand pricing for interruptible workloads.

  3. Which EC2 instance type series is optimized for high-throughput network storage access and is commonly used for data warehousing?

    Answer: D3 instances

    D3 instances provide dense HDD storage with high disk throughput, ideal for distributed file systems and data warehousing.

  4. A company purchases a 1-year Convertible Reserved Instance for an m5.xlarge. Six months later, they need to switch to a c5.2xlarge. What can they do?

    Answer: Exchange it for a Convertible RI of equal or greater value

    Convertible Reserved Instances allow exchange for another Convertible RI of equal or greater value, enabling flexibility to change instance families.

  5. An architect is designing a high-performance computing cluster requiring low-latency, high-bandwidth inter-node communication. Which EC2 feature should they enable?

    Answer: Enhanced Networking with EFA

    Elastic Fabric Adapter (EFA) provides OS-bypass networking for HPC applications requiring ultra-low latency between instances.

  6. What happens to the Spot Instance when AWS needs the capacity back and the Spot price exceeds your maximum bid?

    Answer: The instance receives a 2-minute interruption notice before termination

    AWS provides a 2-minute interruption warning via instance metadata and CloudWatch Events before reclaiming a Spot Instance.

  7. A financial services company needs dedicated physical servers for regulatory compliance but wants per-hour billing flexibility. Which option best fits?

    Answer: Dedicated Instances

    Dedicated Instances run on hardware dedicated to a single customer but are billed per-instance-hour without managing the host directly.