Crucial Exams

AWS Certified CloudOps Engineer Associate SOA-C03 Practice Question

A company deploys an Auto Scaling group of Amazon EC2 instances in two Availability Zones. Each instance runs a Node.js application listening on port 8080. A SysOps administrator creates an Application Load Balancer with an HTTP listener that forwards to a target group by using all default settings. Within minutes CloudWatch shows TargetHealthyCount=0 and users receive HTTP 503 errors. Which configuration issue is the MOST likely cause?

  • The target group is configured to use port 80, so the load balancer sends health checks to a port on which the application is not listening.

  • Cross-zone load balancing is disabled, preventing the load balancer from probing targets in the second Availability Zone.

  • The deregistration delay is longer than the health check interval, causing every instance to be removed before it can pass the health check.

  • The listener should use the TCP protocol instead of HTTP, otherwise the health check probe is blocked.

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