Task 1: Assist in a Root Cause Analysis DVA-C02 Practice Questions (Page 4)

Questions 16–19

1. 16application · medium

   A developer is troubleshooting a failed AWS CloudFormation stack update. The stack update failed during the creation of an Amazon RDS DB instance. The developer needs to find the exact error message from the RDS instance creation. Which log source should the developer examine?

   • AThe CloudTrail logs for the CreateDBInstance API call.
   • BThe CloudFormation stack events in the AWS Management Console.
   • CThe RDS instance's error log in CloudWatch Logs.
   • DThe application's log file on the EC2 instance.
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   A developer is investigating why a Lambda function occasionally throws an unhandled exception. Which debugging technique is MOST effective for isolating the exact line of code causing the failure?

   • AReviewing the stack trace in the CloudWatch Logs error output
   • BAdding console.log statements at each function entry point
   • CDeploying a new version with the AWS X-Ray SDK enabled
   • DIncreasing the function's memory allocation to prevent timeouts
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   A developer's AWS CodeDeploy deployment to an EC2 instance fails. Where should the developer look FIRST to find the specific error message from the deployment scripts?

   • AThe AWS CloudTrail event history
   • BThe CodeDeploy deployment logs on the instance
   • CThe application's CloudWatch Logs group
   • DThe Amazon S3 bucket used for artifact storage
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A developer notices that an AWS Lambda function occasionally returns 5xx errors. The function invokes an Amazon DynamoDB table and an external HTTP API. CloudWatch metrics show increased Duration and Throttles. Which combination of metrics and logs would best isolate whether the external API or DynamoDB is the bottleneck?

   • ACheck Lambda Error count and CloudWatch Logs for stack traces only.
   • BExamine Lambda ConcurrentExecutions and the external API's CloudWatch custom metrics.
   • CCompare Lambda Duration against DynamoDB ThrottledRequests and the external API's response time from application logs.
   • DReview DynamoDB ConsumedReadCapacityUnits and Lambda Invocations metrics.
   Reveal Solution Discussion Select an answer first