amazon aws certified developer - associate dva-c02 practice test
Last exam update: Oct 17 ,2024
Page 1 out of 42. Viewing questions 1-10 out of 414
Question 1
A developer creates a VPC named VPC-A that has public and private subnets. The developer also creates an Amazon RDS database inside the private subnet of VPC-A. To perform some queries, the developer creates an AWS Lambda function in the default VPC. The Lambda function has code to access the RDS database. When the Lambda function runs, an error message indicates that the function cannot connect to the RDS database.
How can the developer solve this problem?
A.
Modify the RDS security group. Add a rule to allow traffic from all the ports from the VPC CIDR block.
B.
Redeploy the Lambda function in the same subnet as the RDS instance. Ensure that the RDS security group allows traffic from the Lambda function.
C.
Create a security group for the Lambda function. Add a new rule in the RDS security group to allow traffic from the new Lambda security group.
D.
Create an IAM role. Attach a policy that allows access to the RDS database. Attach the role to the Lambda function.
Answer:
c
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C 1 votes
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Question 2
A developer maintains applications that store several secrets in AWS Secrets Manager. The applications use secrets that have changed over time. The developer needs to identify required secrets that are still in use. The developer does not want to cause any application downtime.
What should the developer do to meet these requirements?
A.
Configure an AWS CloudTrail log file delivery to an Amazon S3 bucket. Create an Amazon CloudWatch alarm for the GetSecretValue Secrets Manager API operation requests.
B.
Create a secretsmanager-secret-unused AWS Config managed rule. Create an Amazon EventBridge rule to initiate notifications when the AWS Config managed rule is met.
C.
Deactivate the applications secrets and monitor the applications error logs temporarily.
D.
Configure AWS X-Ray for the applications. Create a sampling rule to match the GetSecretValue Secrets Manager API operation requests.
Answer:
a
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Question 3
A developer must provide an API key to an AWS Lambda function to authenticate with a third-party system. The Lambda function will run on a schedule. The developer needs to ensure that the API key remains encrypted at rest.
Which solution will meet these requirements?
A.
Store the API key as a Lambda environment variable by using an AWS Key Management Service (AWS KMS) customer managed key.
B.
Configure the application to prompt the user to provide the password to the Lambda function on the first run.
C.
Store the API key as a value in the application code.
D.
Use Lambda@Edge and only communicate over the HTTPS protocol.
Answer:
c
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B
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C 1 votes
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Question 4
A developer is creating a web application for a school that stores data in Amazon DynamoDB. The ExamScores table has the following attributes: student_id, subject_name, and top_score.
Each item in the ExamScores table is identified with student_id as the partition key and subject_name as the sort key. The web application needs to display the student _id for the top scores for each school subject. The developer needs to increase the speed of the queries to retrieve the student_id for the top scorer for each school subject.
Which solution will meet these requirements?
A.
Create a local secondary index (LSI) with subject_name as the partition key and top_score as the sort key.
B.
Create a local secondary index (LSI) with top_score as the partition key and student_id as the sort key.
C.
Create a global secondary index (GSI) with subject_name as the partition key and top_score as the sort key.
D.
Create a global secondary index (GSI) with subject_name as the partition key and student_id as the sort key.
Answer:
c
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A
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C 1 votes
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Question 5
An application that is deployed to Amazon EC2 is using Amazon DynamoDB. The application calls the DynamoDB REST API. Periodically, the application receives a ProvisionedThroughputExceededException error when the application writes to a DynamoDB table.
Which solutions will mitigate this error MOST cost-effectively? (Choose two.)
A.
Modify the application code to perform exponential backoff when the error is received.
B.
Modify the application to use the AWS SDKs for DynamoDB.
C.
Increase the read and write throughput of the DynamoDB table.
D.
Create a DynamoDB Accelerator (DAX) cluster for the DynamoDB table.
E.
Create a second DynamoDB table. Distribute the reads and writes between the two tables.
Answer:
ab
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A 1 votes
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C 1 votes
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Question 6
A developer has an application that asynchronously invokes an AWS Lambda function. The developer wants to store messages that resulted in failed invocations of the Lambda function so that the application can retry the call later.
What should the developer do to accomplish this goal with the LEAST operational overhead?
A.
Set up Amazon CloudWatch Logs log groups to filter and store the messages in an Amazon S3 bucket. Import the messages in Lambda. Run the Lambda function again.
B.
Configure Amazon EventBridge to send the messages to Amazon Simple Notification Service (Amazon SNS) to initiate the Lambda function again.
C.
Implement a dead-letter queue for discarded messages. Set the dead-letter queue as an event source for the Lambda function.
D.
Send Amazon EventBridge events to an Amazon Simple Queue Service (Amazon SQS) queue. Configure the Lambda function to pull messages from the SQS queue. Run the Lambda function again.
Answer:
c
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Question 7
A company built an online event platform. For each event, the company organizes quizzes and generates leaderboards that are based on the quiz scores. The company stores the leaderboard data in Amazon DynamoDB and retains the data for 30 days after an event is complete. The company then uses a scheduled job to delete the old leaderboard data.
The DynamoDB table is configured with a fixed write capacity. During the months when many events occur, the DynamoDB write API requests are throttled when the scheduled delete job runs.
A developer must create a long-term solution that deletes the old leaderboard data and optimizes write throughput.
Which solution meets these requirements?
A.
Configure a TTL attribute for the leaderboard data.
B.
Use DynamoDB Streams to schedule and delete the leaderboard data.
C.
Use AWS Step Functions to schedule and delete the leaderboard data.
D.
Set a higher write capacity when the scheduled delete job runs.
Answer:
d
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Question 8
A company uses AWS Lambda functions and an Amazon S3 trigger to process images into an S3 bucket. A development team set up multiple environments in a single AWS account.
After a recent production deployment, the development team observed that the development S3 buckets invoked the production environment Lambda functions. These invocations caused unwanted execution of development S3 files by using production Lambda functions. The development team must prevent these invocations. The team must follow security best practices.
Which solution will meet these requirements?
A.
Update the Lambda execution role for the production Lambda function to add a policy that allows the execution role to read from only the production environment S3 bucket.
B.
Move the development and production environments into separate AWS accounts. Add a resource policy to each Lambda function to allow only S3 buckets that are within the same account to invoke the function.
C.
Add a resource policy to the production Lambda function to allow only the production environment S3 bucket to invoke the function.
D.
Move the development and production environments into separate AWS accounts. Update the Lambda execution role for each function to add a policy that allows the execution role to read from the S3 bucket that is within the same account.
Answer:
c
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Question 9
A developer created an AWS Lambda function that accesses resources in a VPC. The Lambda function polls an Amazon Simple Queue Service (Amazon SQS) queue for new messages through a VPC endpoint. Then the function calculates a rolling average of the numeric values that are contained in the messages. After initial tests of the Lambda function, the developer found that the value of the rolling average that the function returned was not accurate.
How can the developer ensure that the function calculates an accurate rolling average?
A.
Set the function's reserved concurrency to 1. Calculate the rolling average in the function. Store the calculated rolling average in Amazon ElastiCache.
B.
Modify the function to store the values in Amazon ElastiCache. When the function initializes, use the previous values from the cache to calculate the rolling average.
C.
Set the function's provisioned concurrency to 1. Calculate the rolling average in the function. Store the calculated rolling average in Amazon ElastiCache.
D.
Modify the function to store the values in the function's layers. When the function initializes, use the previously stored values to calculate the rolling average.
Answer:
c
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Question 10
A developer is creating an AWS Lambda function that consumes messages from an Amazon Simple Queue Service (Amazon SQS) standard queue. The developer notices that the Lambda function processes some messages multiple times.
How should developer resolve this issue MOST cost-effectively?
A.
Change the Amazon SQS standard queue to an Amazon SQS FIFO queue by using the Amazon SQS message deduplication ID.
B.
Set up a dead-letter queue.
C.
Set the maximum concurrency limit of the AWS Lambda function to 1.
D.
Change the message processing to use Amazon Kinesis Data Streams instead of Amazon SQS.