Task Statement 5.3: Troubleshoot System and Application Failures. DOP-C02 Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   Which of the following is the primary purpose of root cause analysis in troubleshooting?

   • ATo quickly restore service by applying a temporary workaround.
   • BTo assign blame to the team or individual responsible for the failure.
   • CTo document all possible failure modes for future reference.
   • DTo identify the underlying cause of a failure so that permanent corrective actions can be taken.
   Reveal Solution Discussion Select an answer first
2. 22application · medium

   A company runs a web application on EC2 instances in an Auto Scaling group. The scaling policy is based on a custom CloudWatch metric that measures the number of requests in the queue. The Auto Scaling group is not scaling out as expected during peak traffic. The DevOps team has verified that the CloudWatch metric is being published correctly. What should the team investigate NEXT?

   • ACheck the instance's health check grace period.
   • BCheck the CloudWatch alarm's period and evaluation periods.
   • CCheck the scaling policy's target value and the cooldown period.
   • DCheck the Auto Scaling group's minimum and maximum size.
   Reveal Solution Discussion Select an answer first
4. 23foundation · easy

   A pod in an EKS cluster is stuck in the Pending state. Which command or view would provide the most immediate information about why the pod cannot be scheduled?

   • Akubectl get deployments
   • Bkubectl get nodes
   • Ckubectl logs <pod-name>
   • Dkubectl describe pod <pod-name>
   Reveal Solution Discussion Select an answer first
5. 24expert · hard

   A company uses CloudWatch Synthetics canaries to monitor a web application. After a recent deployment, the canaries started failing. The DevOps team has verified that the application is healthy and responding correctly. The canary is configured to use a VPC and a security group. What is the MOST likely cause of the canary failures?

   • AThe canary's runtime version is outdated and incompatible with the application's new version.
   • BThe canary's VPC configuration is incorrect, and it cannot access the application's VPC.
   • CThe canary's schedule is set to run too frequently, causing it to be throttled.
   • DThe canary's security group does not allow outbound traffic to the application.
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A company runs a stateful web application on Amazon EC2 instances behind an Application Load Balancer (ALB) in an Auto Scaling group. Users report intermittent 502 errors. The DevOps team notices that the ALB's healthy host count drops to zero for a few minutes several times a day, then recovers. CloudWatch metrics show the instances' CPU utilization never exceeds 40%, and the memory usage is stable. The application logs show no errors before the failures. Which investigation step is MOST likely to reveal the root cause?

   • ACheck the Auto Scaling group's scaling activities and the EC2 instance status checks for the affected instances.
   • BVerify that the ALB's idle timeout is set higher than the application's response time.
   • CAnalyze the application's thread dump from the affected instances to look for deadlocks.
   • DReview the ALB access logs to identify the client IP addresses that receive the 502 responses.
   Reveal Solution Discussion Select an answer first