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Amazon DVA-C02 Practice Test - Questions Answers, Page 24
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Question 231
A developer is receiving HTTP 400: ThrottlingException errors intermittently when calling the Amazon CloudWatch API. When a call fails, no data is retrieved.
What best practice should first be applied to address this issue?
Contact AWS Support for a limit increase.
Use the AWS CLI to get the metrics.
Analyze the applications and remove the API call.
Retry the call with exponential backoff.
Question 232
A developer needs to troubleshoot an AWS Lambda function in a development environment. The Lambda function is configured in VPC mode and needs to connect to an existing Amazon RDS for SOL Server DB instance. The DB instance is deployed in a private subnet and accepts connections by using port 1433.
When the developer tests the function, the function reports an error when it tries to connect to the database.
Which combination of steps should the developer take to diagnose this issue? (Select TWO.)
Check that the function's security group has outbound access on port 1433 to the DB instance's security group. Check that the DB instance's security group has inbound access on port 1433 from the function's security group.
Check that the function's security group has Inbound access on port 1433 from the DB Instance's security group. Check that the DB instance's security group has outbound access on port 1433 to the function's security group.
Check that the VPC is set up for a NAT gateway. Check that the DB instance has the public access option turned on.
Check that the function's execution role permissions include rds:DescribeDBInstances, rds: ModifyDB Instance, and rds:DescribeDBSecurityGroups for the DB instance.
Check that the function's execution rote permissions include ec2: CreateNetworklnterface. ec2: DescribeNetworklnterfaces. and ec2: DeleteNetworklnterface.
Question 233
A developer is building an application on AWS. The application has an Amazon API Gateway API that sends requests to an AWS Lambda function. The API is experiencing increased latency because the Lambda function has limited available CPU to fulfill the requests.
Before the developer deploys the API into production, the developer must configure the Lambda function to have more CPU.
Which solution will meet this requirement?
Increase the virtual CPU (vCPU) cores quota of the Lambda function.
Increase the amount of memory that is allocated to the Lambda function.
Increase the ephemeral storage size of the Lambda function.
Increase the timeout value of the Lambda function.
Question 234
A company caches session information for a web application in an Amazon DynamoDB table. The company wants an automated way to delete old items from the table.
What is the simplest way to do this?
Write a script that deletes old records; schedule the script as a cron job on an Amazon EC2 instance.
Add an attribute with the expiration time; enable the Time To Live feature based on that attribute.
Each day, create a new table to hold session data; delete the previous day's table.
Add an attribute with the expiration time; name the attribute ItemExpiration.
Question 235
A company requires that all applications running on Amazon EC2 use 1AM roles to gam access to AWS services. A developer is modifying an application that currently relies on 1AM user access keys stored in environment variables to access Amazon DynamoDB tables using boto, the AWS SDK for Python.
The developer associated a role with the same permissions as the 1AM user to the EC2 instance, then deleted the 1AM user. When the application was restarted, the AWS
Access Denied Exception messages started appearing in the application logs. The developer was able to use their personal account on the server to run DynamoDB API commands using the AWS CLI.
What is the MOST likely cause of the exception?
1AM policies might take a few minutes to propagate to resources.
Disabled environment variable credentials are still being used by the application.
The AWS SDK does not support credentials obtained using an instance role.
The instance's security group does not allow access to http://169.254.169.254.
Question 236
A developer wants the ability to roll back to a previous version of an AWS Lambda function in the event of errors caused by a new deployment. How can the developer achieve this with MINIMAL impact on users?
Change the application to use an alias that points to the current version. Deploy the new version of the code Update the alias to use the newly deployed version. If too many errors are encountered, point the alias back to the previous version.
Change the application to use an alias that points to the current version. Deploy the new version of the code. Update the alias to direct 10% of users to the newly deployed version. If too many errors are encountered, send 100% of traffic to the previous version
Do not make any changes to the application. Deploy the new version of the code. If too many errors are encountered, point the application back to the previous version using the version number in the Amazon Resource Name (ARN).
Create three aliases: new, existing, and router. Point the existing alias to the current version. Have the router alias direct 100% of users to the existing alias. Update the application to use the router alias. Deploy the new version of the code. Point the new alias to this version. Update the router alias to direct 10% of users to the new alias. If too many errors are encountered, send 100% of traffic to the existing alias.
Question 237
A company has an online web application that includes a product catalog. The catalog is stored in an Amazon S3 bucket that is named DOC-EXAMPLE-BUCKET. The application must be able to list the objects in the S3 bucket and must be able to download objects through an 1AM policy.
Which policy allows MINIMUM access to meet these requirements?
Option A
Option B
Option C
Option D
Question 238
A developer is building an application that uses an AWS Lambda function to process data. The application requires minimum latency. The Lambda function must have predictable function start times. All setup activities for the execution environment must happen before invocation of the Lambda function.
Which solution will meet these requirements?
Increase the memory of the Lambda function to the maximum amount. Configure an Amazon EventBridge rule to schedule invocations of the Lambda function every minute to keep the execution environment active.
Optimize the static initialization code that runs when a new execution environment is prepared for the first time. Decrease and compress the size of the Lambda function package and the imported libraries and dependencies.
Increase the reserved concurrency of the Lambda function to the maximum value for unreserved account concurrency. Run any setup activities manually before the initial invocation of the Lambda function.
Publish a new version of the Lambda function. Configure provisioned concurrency for the Lambda function with the required minimum number of execution environments.
Question 239
A company uses an AWS Lambda function to transfer files from an Amazon S3 bucket to the company's SFTP server. The Lambda function connects to the SFTP server by using credentials such as username and password. The company uses Lambda environment variables to store these credentials.
A developer needs to implement encrypted username and password credentials.
Which solution will meet these requirements?
Remove the user credentials from the Lambda environment. Implement 1AM database authentication.
Move the user credentials from Lambda environment variables to AWS Systems Manager Parameter Store.
Move the user credentials from Lambda environment variables to AWS Key Management Service (AWS KMS).
Move the user credentials from the Lambda environment to an encrypted .txt file. Store the file in an S3 bucket.
Question 240
A developer needs to modify an application architecture to meet new functional requirements. Application data is stored in Amazon DynamoDB and processed tor analysis in a nightly batch. The system analysts do not want to wait until the next day to view the processed data and have asked to have it available in near-real time.
Which application architecture pattern would enable the data to be processed as it is received?
Event driven
Client-server d riven
Fan-out driven
Schedule driven
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