Task 2.1: Implement Scalability and Elasticity. SOA-C03 Practice Questions (Page 5)

Questions 21–25

1. 21expert · hard

   A company runs a web application on EC2 instances in an Auto Scaling group behind an Application Load Balancer. The application experiences a sudden spike in traffic, and the Auto Scaling group scales out, but the new instances take several minutes to become healthy and start receiving traffic. During this time, the existing instances are overwhelmed, and users experience errors. The operations team wants to reduce the time it takes for new instances to become ready. What should they do?

   • AConfigure the load balancer to send traffic to instances before they are healthy
   • BUse a step scaling policy with a larger adjustment
   • CIncrease the cooldown period for the Auto Scaling group
   • DUse an EC2 Auto Scaling warm pool to pre-initialize instances
   Reveal Solution Discussion Select an answer first
2. 22application · medium

   A company runs a mobile application backend that uses DynamoDB. The workload is unpredictable, with occasional spikes in traffic that last a few minutes. The operations team wants to avoid throttling during these spikes without manual intervention, and they are willing to pay a higher per-request cost for the convenience. What should they configure?

   • AUse provisioned capacity with auto scaling
   • BEnable DynamoDB Accelerator (DAX)
   • CSwitch the table to on-demand capacity mode
   • DCreate a global table in another Region
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A company runs a news website that uses ElastiCache for Redis to cache article content. When an article is updated, the website must reflect the changes immediately for all users. The operations team has noticed that some users still see stale content after an update. What should they do to ensure updated articles are served immediately?

   • ADelete the cache key for the updated article from Redis
   • BDisable caching for the entire application
   • CUse a cache-aside pattern with a short TTL
   • DIncrease the TTL for all cached articles
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   What is the primary benefit of using scheduled scaling actions in an Auto Scaling group?

   • AThey automatically adjust capacity based on real-time demand
   • BThey provide a way to manually adjust capacity
   • CThey allow you to proactively adjust capacity ahead of expected traffic changes
   • DThey eliminate the need for CloudWatch alarms
   Reveal Solution Discussion Select an answer first
6. 25expert · hard

   A company runs a global website that serves both static and dynamic content through CloudFront. The static content is stored in S3 and changes rarely, while the dynamic content is generated by EC2 instances and changes frequently. The operations team wants to optimize cache behavior for both types of content. What should they do?

   • ADisable caching for all content to ensure freshness
   • BUse a single cache behavior with a medium TTL for all content
   • CConfigure separate cache behaviors for static and dynamic content, with a long TTL for static and a short TTL or no caching for dynamic
   • DUse Lambda@Edge to cache dynamic content at the edge
   Reveal Solution Discussion Select an answer first