Task 1: Assist in a Root Cause Analysis DVA-C02 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   A developer notices that an application is returning errors but the CloudWatch Logs show no ERROR-level entries. Which AWS service should be used to trace the request path across multiple microservices to find where the error originates?

   • AAWS CloudTrail
   • BAWS X-Ray
   • CAmazon EventBridge
   • DAmazon CloudWatch Alarms
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2. 7foundation · easy

   A developer wants to emit a custom metric from a Lambda function using the CloudWatch embedded metric format (EMF). What is the primary benefit of using EMF over the PutMetricData API?

   • AEMF can publish metrics to multiple regions simultaneously
   • BEMF supports metrics with a higher resolution than PutMetricData
   • CEMF does not require AWS credentials to publish metrics
   • DEMF allows metrics to be extracted from structured logs without separate API calls
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4. 8foundation · easy

   A developer needs to understand why a Lambda function is taking longer than expected to complete. Which CloudWatch metric would reveal the duration of each invocation?

   • AThrottles
   • BDuration
   • CError count
   • DInvocations
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5. 9application · medium

   A developer is investigating why an application cannot read messages from an Amazon SQS queue. The application runs on EC2 instances with an IAM role. The SQS queue policy allows the role to receive messages. The application logs show 'AccessDenied' errors. Which debugging step should the developer take first?

   • ACheck the SQS queue policy for a mismatch between the principal and the IAM role's ARN.
   • BReview the application code to ensure it uses the correct queue URL.
   • CConfirm that the SQS queue is in the same AWS Region as the EC2 instances.
   • DVerify that the IAM role's trust policy allows EC2 to assume the role.
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6. 10foundation · easy

   A developer is writing a Lambda function that processes orders and needs to emit a custom metric for the order total. Using the CloudWatch embedded metric format, which JSON structure correctly defines this metric?

   • A{"_aws": {"Timestamp": 1234567890}, "OrderTotal": 150.00}
   • B{"_aws": {"Timestamp": 1234567890, "CloudWatchMetrics": [{"Namespace": "OrderService", "Metrics": [{"Name": "OrderTotal", "Unit": "Count"}]}]}, "OrderTotal": 150.00}
   • C{"Namespace": "OrderService", "MetricName": "OrderTotal", "Value": 150.00}
   • D{"Metric": {"Name": "OrderTotal", "Value": 150.00, "Unit": "Count"}}
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