Crucial Exams

AWS Certified CloudOps Engineer Associate SOA-C03 Practice Question

A DevOps engineer manages an ElastiCache for Redis replication group used as a read cache for a high-traffic web application. Request volume fluctuates sharply, with replica CPU utilization often exceeding 75 % during campaigns and dropping below 20 % at night. The engineer must automatically adjust the number of replicas per node group to maintain performance while minimizing cost, and must avoid downtime or manual intervention. Which solution meets these requirements?

  • Configure Application Auto Scaling with a target-tracking policy on the replication group's AverageCPUUtilization metric, specifying minimum and maximum replicas for each node group so replicas are added or removed automatically.

  • Enable Redis cluster mode and use online cluster resizing to manually add or remove shards whenever CPU utilization crosses predefined limits.

  • Create an Amazon EventBridge rule that triggers a nightly AWS Lambda function to call ModifyReplicationGroup and adjust replica counts based on stored thresholds.

  • Place each Redis node behind an Application Load Balancer and put the nodes in an EC2 Auto Scaling group that scales on CPU utilization.

AWS Certified CloudOps Engineer Associate SOA-C03
Reliability and Business Continuity
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