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Certified Solutions Architect High Availability and Scalability 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.

Read the first 7 Certified Solutions Architect High Availability and Scalability flashcards as text

  1. A company wants to run a stateless web tier that scales to zero when there is no traffic. Which AWS service best achieves this with the lowest operational overhead?

    Answer: AWS Lambda with API Gateway

    Lambda scales to zero automatically and only runs when invoked, making it ideal for workloads that need true scale-to-zero with no idle costs.

  2. An application requires that user sessions persist even when requests are routed to different EC2 instances. Which solution maintains high availability without sticky sessions?

    Answer: Store session data in Amazon ElastiCache Redis

    Storing sessions in ElastiCache Redis externalizes state so any instance can serve any request, enabling true stateless scaling.

  3. A company deploys a Multi-AZ RDS instance and a read replica in a different region. A full region outage occurs. What manual action is required?

    Answer: The read replica must be manually promoted to a standalone DB instance

    Cross-region read replicas require manual promotion during a region outage; they are not part of the automatic Multi-AZ failover mechanism.

  4. Which Auto Scaling lifecycle hook allows a custom script to run before an instance is terminated during a scale-in event?

    Answer: EC2_INSTANCE_TERMINATING hook with CONTINUE action

    The EC2_INSTANCE_TERMINATING hook pauses termination, allowing cleanup scripts to run, and CONTINUE resumes the termination afterward.

  5. A solutions architect needs an active-active multi-region architecture for a DynamoDB-backed application. Which DynamoDB feature enables this?

    Answer: DynamoDB Global Tables

    DynamoDB Global Tables provide multi-region, fully replicated tables that support active-active reads and writes in any configured region.

  6. An API Gateway REST API experiences throttling errors during peak load. Which strategy reduces throttling without changing the backend architecture?

    Answer: Enable API Gateway caching with a TTL

    API Gateway caching stores responses for a specified TTL, reducing backend calls and throttling during repeated identical requests.

  7. A company has an Auto Scaling group behind an ALB. During deployments, they want to avoid sending traffic to instances that are still initializing. Which feature handles this?

    Answer: EC2 Auto Scaling instance warm-up period

    The Auto Scaling instance warm-up period prevents newly launched instances from contributing to scaling metrics until the app is fully initialized.