AWS Certified Developer - Associate (DVA-C02) - Practice Exam 3

You are working on a social media application that allows users to share BBQ recipes and photos. You would like to schedule a Lambda function to run every 10 minutes that checks for the latest posts and sends a notification, including an image thumbnail, to users who have previously engaged with posts from the same user. How can you configure your function to automatically run at 10-minute intervals?

• Use Lambda with cron to schedule the function.

• Use EC2 with cron to schedule the function.

• Use Amazon EventBridge Events to schedule the function.

• Use Amazon Simple Workflow Service (SWF) to schedule the function.

You are working on a serverless application written in Python and running in Lambda. You have uploaded multiple versions of your code to Lambda, but would like to make sure your test environment always utilizes the latest version. Which methods can achieve this with the least amount of development effort?

(Choose3)

• Reference the function using a qualified ARN and the $LATEST suffix.

• Reference the function using an unqualified ARN.

• Create another function to automatically update your function alias to point to the latest version of the code every time it is updated.

• Create an alias and provide the name of the most recent version of your function.

• Configure the alias to automatically update to point to the latest version of the code every time it is updated.

You are developing a video streaming application that users can access using multiple devices, for example, laptop, tablet, and cell phone. You would like to be able to track usage across the different devices and limit the number of devices from which a user can stream content. Which of the following AWS technologies could you use to achieve this?

• Store device metadata linked to session state in ElastiCache.

• Use Cognito to track and remember the devices.

• Use S3 to store metadata about the device and link it to session state held in DynamoDB.

• Use MFA on the device to track and remember the devices.

You are migrating a restaurant booking application from your own data center to AWS. The application currently runs on a number of virtual machines running web and application servers, as well as a shared database server. The application needs to access a large number of shared images and documents containing drinks and food menus. You would like to implement a solution that includes shared storage and also grants the EC2 instances permissions to access the shared files. Which of the following options can best meet your needs?

(Choose2)

• Store the files in ElastiCache.

• Generate a pre-signed URL to grant access.

• Use an IAM instance role to grant access.

• Embed IAM credentials in the EC2 instance metadata.

• Store the files in S3.

A developer wants to track the average time it takes to complete customer transactions for an application running on a group of EC2 instances, including the ability to view and track statistics, like how long it takes to complete an average customer request and the maximum request latency, across the all instances. The support team would like to receive an immediate notification if the average transaction completion time exceeds three seconds for one minute or longer. Which of the following will meet these requirements?

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  Configure a Lambda function to record transaction completion times, and add them to a log file stored in S3. Use Athena to query the S3 data based on transaction completion time, and create a CloudWatch dashboard based on the completion times to view the latest statistics. Configure a CloudWatch alarm to send an SNS notification to the support team if the average transaction completion time exceeds three seconds for one minute or longer.

• 
  

  Configure the application to record transaction completion times to the operating system log file. Install and configure the Amazon CloudWatch agent on the EC2 instances and send the operating system log to CloudWatch Logs. Use a metric filter based on transaction completion time, and create a CloudWatch dashboard based on the metric to view the latest statistics. Configure a CloudWatch alarm to send an SQS notification to the support team if the average transaction completion time exceeds three seconds for one minute or longer.

• Install and configure the Amazon CloudWatch agent on the EC2 instances to send operating system metric data to CloudWatch. Use a metric filter based on transaction completion time, and create a CloudWatch dashboard based on the metric to view the latest statistics. Configure a CloudWatch alarm to send an SNS notification to the support team if the average transaction completion time exceeds three seconds for one minute or longer.

• Configure the application to record transaction completion times to an application log file. Install and configure the CloudWatch agent on the EC2 instances, and send the application log to CloudWatch Logs. Use a metric filter based on transaction completion time, and create a CloudWatch dashboard based on the metric to view the latest statistics. Configure a CloudWatch alarm to send an SNS notification to the support team if the average transaction completion time exceeds three seconds for one minute or longer.

You are developing a healthy-eating application that tracks nutrition and water intake on a daily basis. Your users mainly access the application using a mobile device like a cell phone or tablet. You are planning to run a promotion to attract new users by providing a free trial period, and you would like to make it easy for guest users to trial your application. Which of the following can you use to configure access for guest users?

• Identity federation with SAML

• Cognito identity pools

• IAM user pools

• Identity federation with AWS

You are designing a high-performance, low-latency application that needs super fast database read and write performance. The CTO has requested that you implement a solution that can deliver microsecond read and single-digit millisecond write latency for database operations. Your dataset is currently 25 TB and is not expected to increase in size beyond 60 TB. Which of the following solutions would you suggest?

• Store the entire dataset in MemoryDB for Redis.

• Store frequently accessed data in ElastiCache for Memcached.

• Implement RDS Proxy and use connection pooling to reduce latency for database operations.

• Store the entire dataset in ElastiCache for Redis.

A developer is making changes to the CloudFormation template used to deploy an application. They would like to know if any existing resources will be deleted or replaced before applying the template updates. What service feature will enable this?

• CloudFormation change sets

• CloudFormation rolling updates

• CloudFormation registry

• CloudFormation StackSets

You are using CloudFront to serve static website content to users based in multiple locations across the USA, Africa, India, and the Middle East. You recently made some significant updates to the website, but users are complaining that they can only see the original content. What can you do to make sure the latest version of the website is being served by CloudFront?

• Invalidate the file from the CloudFront edge caches.

• Update the file in the original location and reset the cache timestamp.

• Wait for the cache to expire.

• Delete the file from the original location and replace it with a new version.

When developing and testing a Lambda function, you would like to email a copy of the invocation record of any failed Lambda invocations to the support team so that they can investigate. Which of the following options would you recommend?

• Configure an SNS topic and subscribe the support team email address to the SNS topic. Configure a CloudWatch alarm to send any failed invocation records to the SNS topic.

• Configure an SQS queue as a Lambda dead letter queue to receive details of the failed invocations and subscribe the support team email address to the SQS queue.

• Configure an SNS topic as a destination for failed invocations and subscribe the support team email address to the SNS topic.

• Configure an SNS topic and subscribe the support team email address to the SNS topic. Configure an SQS queue as a Lambda dead letter queue to receive details of the failed invocations. Have the SNS topic poll the queue periodically and email the support team with details of any failed invocations.