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Troubleshooting Scenario Questions

Practise AWS Certified Developer Associate DVA-C02 practice questions — original exam-style scenarios covering every exam domain, with detailed explanations, wrong-answer analysis, and common exam traps.

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15
scenario questions
DVA-C02
exam code
Amazon Web Services
vendor

Scenario guide

How to approach troubleshooting scenario questions

These questions describe a network symptom and ask you to identify the root cause or the correct fix. They appear across all certification exams and reward systematic thinking over memorisation. The best candidates follow a consistent troubleshooting framework even under time pressure.

Quick answer

Troubleshooting Scenario Questions questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

Related practice questions

Related DVA-C02 topic practice pages

Scenario questions usually connect to one or more exam topics. Use these links to review the underlying concepts behind the scenario.

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DVA-C02 troubleshooting practice questions

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Practice set

Practice scenarios

Question 1mediummultiple choice
Full question →

A developer is troubleshooting an AWS Lambda function that is triggered by an S3 event. The function occasionally fails with a timeout error. CloudWatch logs show that the timeout occurs during the processing of large files. The function has a memory setting of 128 MB and a timeout of 3 seconds. The developer wants to process large files without modifying the code. Which parameter should the developer adjust first?

Question 2hardmultiple choice
Full question →

Based on the CloudTrail log entry, which security concern should be investigated?

Exhibit

Refer to the exhibit.
CloudTrail log entry:
{
  "eventVersion": "1.08",
  "userIdentity": {
    "type": "AssumedRole",
    "arn": "arn:aws:sts::123456789012:assumed-role/AdminRole/MySession",
    "accountId": "123456789012",
    "sessionContext": {
      "sessionIssuer": {
        "type": "Role",
        "arn": "arn:aws:iam::123456789012:role/AdminRole"
      },
      "attributes": {
        "creationDate": "2024-01-15T10:00:00Z",
        "mfaAuthenticated": "false"
      }
    }
  },
  "eventTime": "2024-01-15T10:05:00Z",
  "eventSource": "ec2.amazonaws.com",
  "eventName": "RunInstances",
  "awsRegion": "us-east-1",
  "sourceIPAddress": "203.0.113.5",
  "userAgent": "console.amazonaws.com",
  "requestParameters": {
    "instancesSet": {
      "items": [
        {
          "imageId": "ami-0abcdef1234567890"
        }
      ]
    }
  }
}
Question 3hardmultiple choice
Full question →

A developer is troubleshooting access to an S3 bucket from an EC2 instance. The instance has an IAM role with a policy that allows s3:GetObject on the bucket. However, the application receives an AccessDenied error. The bucket policy is as follows:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::123456789012:role/AppRole"
      },
      "Action": "s3:GetObject",
      "Resource": "arn:aws:s3:::my-bucket/*"
    }
  ]
}

The EC2 instance is using the correct IAM role. What is the most likely cause of the error?

Question 4hardmultiple choice
Study the full Python automation breakdown →

A developer is troubleshooting an AWS Lambda function that processes large CSV files (up to 1 GB) uploaded to an Amazon S3 bucket. The function uses Python and the pandas library to perform data transformations. Recently, the function started timing out on large files. CloudWatch Logs show that the function's execution time is close to the 15-minute Lambda timeout, and memory utilization peaks at around 80% of the configured 3,008 MB. The function has not been modified in months. Which action will most likely resolve the timeout issue without requiring code changes?

Question 5mediummulti select
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A developer is troubleshooting a slow web application. The application uses an Application Load Balancer, EC2 instances, and an RDS database. The developer suspects the database is the bottleneck. Which TWO CloudWatch metrics should the developer examine to confirm this? (Select TWO.)

Question 6hardmultiple choice
Full question →

Refer to the exhibit. A developer is troubleshooting a failed CodeDeploy deployment to an EC2 Auto Scaling group. The instance logs show that the 'BeforeInstall' script failed with exit code 1. What should the developer do to resolve the issue?

Exhibit

DeploymentId: d-EXAMPLE123
Status: FAILED
Error: The overall deployment failed because too many individual instances failed deployment, too few healthy instances are available, or some instances in your deployment group are experiencing problems.

Instance logs:
i-abc12345: Script 'BeforeInstall' failed with exit code 1
Question 7mediummultiple choice
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A company uses CodePipeline to deploy a web application to Elastic Beanstalk. The deployment fails at the Build stage with an error 'BUILD FAILED'. Which step should the developer take first to troubleshoot?

Question 8mediummultiple choice
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A developer is troubleshooting an AWS Lambda function that occasionally fails with a timeout error. The function makes HTTP requests to external APIs. The function's current timeout setting is 30 seconds. The developer wants to implement a solution that reduces the chance of timeouts without increasing the Lambda timeout. Which approach should the developer take?

Question 9mediummultiple choice
Full question →

The exhibit shows an IAM policy attached to a user. The user reports being unable to upload files to S3 bucket 'my-bucket'. What is the MOST likely cause?

Exhibit

Refer to the exhibit.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "s3:GetObject",
      "Resource": "arn:aws:s3:::my-bucket/*"
    },
    {
      "Effect": "Allow",
      "Action": "s3:PutObject",
      "Resource": "arn:aws:s3:::my-bucket/*"
    }
  ]
}
Question 10easymulti select
Full question →

A developer is troubleshooting an AWS Lambda function that is timing out. The function is configured with a 3-second timeout. Which of the following could cause the function to timeout? (Choose THREE.)

Question 11hardmultiple choice
Full question →

A developer deploys this CloudFormation template. The Lambda function fails to access the DynamoDB table 'MyTable'. What is the most likely cause?

Exhibit

Refer to the exhibit.

```
Resources:
  MyLambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      Code:
        S3Bucket: my-bucket
        S3Key: my-function.zip
      Handler: index.handler
      Role: arn:aws:iam::123456789012:role/lambda-role
      Runtime: nodejs18.x
      Environment:
        Variables:
          TABLE_NAME: MyTable
```
Question 12mediummultiple choice
Review the full subnetting walkthrough →

A developer is deploying an application on Amazon ECS using the Fargate launch type. The application needs to communicate with a DynamoDB table. The developer creates a VPC with private subnets and configures the ECS service to use those subnets. However, the tasks cannot reach DynamoDB. What is the MOST likely cause?

Question 13mediummulti select
Full question →

A developer is troubleshooting a Lambda function that times out when processing large files from Amazon S3. The function is configured with a 3-minute timeout and 128 MB memory. Which TWO actions would MOST likely resolve the issue? (Choose TWO.)

Question 14hardmultiple choice
Read the full NAT/PAT explanation →

A developer is deploying a serverless application that includes an AWS Lambda function with a dependency on a native library (e.g., a compiled C library). The developer uses AWS SAM. The Lambda function runs correctly in the local development environment but fails with an 'Unable to import module' error when deployed. What is the most likely cause?

Question 15mediummultiple choice
Full question →

A developer is troubleshooting an issue where an IAM user is unable to upload a file to an S3 bucket that uses server-side encryption with AWS KMS (SSE-KMS). The IAM policy shown in the exhibit is attached to the user. What is the likely cause of the failure?

Exhibit

Refer to the exhibit.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:PutObject"
      ],
      "Resource": "arn:aws:s3:::my-bucket/*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "kms:Decrypt",
        "kms:GenerateDataKey"
      ],
      "Resource": "arn:aws:kms:us-east-1:123456789012:key/abc123"
    }
  ]
}

These DVA-C02 practice questions are part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style DVA-C02 questions with detailed explanations, topic-based practice, mock exams, readiness tracking, and study analytics.