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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 web application experiences predictable traffic spikes every weekday from 9 AM to 6 PM. Which Reserved Instance offering type provides the most savings for this scheduled pattern?

    Answer: Scheduled Reserved Instances

    Scheduled Reserved Instances let you reserve capacity for specific time windows, matching predictable recurring workloads at lower cost.

  2. Which EC2 instance family uses AWS Graviton processors and is known for delivering the best price-performance ratio for general-purpose workloads?

    Answer: M6g instances

    M6g instances use AWS Graviton2 ARM-based processors and offer up to 40% better price-performance than comparable x86 instances.

  3. A database server needs consistent, high CPU performance without throttling at any time. The workload runs at 70% CPU continuously. Which instance type is most appropriate?

    Answer: M5 general purpose instance

    M5 instances provide consistent full-core CPU performance without bursting credits, suited for sustained high-CPU workloads.

  4. What is the primary difference between an EC2 Dedicated Host and a Dedicated Instance?

    Answer: Dedicated Hosts give visibility and control over the physical server, Dedicated Instances do not

    Dedicated Hosts provide visibility into sockets and cores on the physical server (required for some BYOL licenses), while Dedicated Instances only guarantee hardware isolation.

  5. A solution architect needs to run a stateless web tier that scales from 2 to 50 instances based on load. Which purchasing strategy minimizes cost while ensuring baseline availability?

    Answer: Reserved Instances for baseline + Spot for scale-out

    Using Reserved Instances for the predictable minimum capacity and Spot Instances for burst scaling is the standard cost-optimized architecture.

  6. Which EC2 instance type is best suited for an in-memory database like Redis or Memcached at large scale?

    Answer: R6g memory-optimized

    R-family (memory-optimized) instances provide high RAM-to-CPU ratios ideal for in-memory databases and caching workloads.

  7. A company has unused Standard Reserved Instances it no longer needs. What should they do to recover value from these?

    Answer: Sell them on the AWS Reserved Instance Marketplace

    The AWS Reserved Instance Marketplace allows customers to sell their unused Standard RIs (not Convertible) to other AWS customers.