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DVA-C01 Exam Dumps - AWS Certified Developer Associate Exam

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Question # 49

A data-processing application includes an AWS Lambda function that processes data in several steps. Recently, the function has been reaching the Lambda tii A developer wants to use AWS X-Ray to find out how long each step is taking so that the developer can determine which step is causing the timeout.

Which combination of actions should the developer take to accomplish this goal? (Select TWO.)

Modify the application to call the PutMetricData API operation after each processing step. Include the time taken in milliseconds.

Use the aws lambda update-function-configuration AWS CLI command to enable active tracing on the Lambda function.

Modify the application to record each processing step in an X-Ray subsegment by using the X-Ray software development kit (SDK).

Add the xray:PutTraceSegments permission and the xray:PutTelemetryRecords permission to the Lambda function's execution role.

Modify the application to put each processing step in a separate Lambda layer. Include all the layers in the Lambda function.

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Question # 50

A company has an application that provides blog hosting services to its customers. The application includes an Amazon DynamoDB table with a primary key The primary key consists of the customers' UserName as a partition key and the NumberOIBIogs as a sort key. The application stores the TotalReactionsOnBlogs as an attribute on the same DynamoDB table.

A developer needs to implement an operation to retrieve the top 10 customers based on the greatest number of reactions on their blogs This operation must not consume the DynamoDB table's existing read capacity.

What should the developer do to meet these requirements in the MOST operationally efficient manner?

For the existing DynamoDB table, create a new global secondary index (GSI) that has the UserName as a partition key and the TotalReactionsOnBlogs as a sort key.

For the existing DynamoDB table, create a new local secondary index (LSI) that has the UserName as a partition key and the TotalReactionsOnBlogs as a sort key

Back up and restore the DynamoDB table to a new DynamoDB table Create a new global secondary index (GSI) that has the UserName as a partition key and the TotalReactionsOnBlogs as a sort key Delete the old DynamoDB table

Back up and restore the DynamoDB table to a new DynamoDB table. Create a new local secondary index (LSI) that has the UserName as a partition key and the TotalReactionsOnBlogs as a sort key. Delete the old DynamoDB table.

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Question # 51

A company is developing a web application that allows its employees to upload a profile picture to a private Amazon S3 bucket There is no size limit for the profile pictures, which should be displayed every time an employee logs in. For security reasons, the pictures cannot be publicly accessible.

What is a viable long-term solution for this scenario''

Generate a presigned URL when a picture is uploaded Save the URL in an Amazon DynamoDB table Return the URL to the browser when the employee logs in

Save the picture's S3 key in an Amazon DynamoDB table Create an Amazon S3 VPC endpoint to allow the employees to download pictures once they log in.

Encode a picture using base64 Save the base64 string in an Amazon DynamoDB table Allow the browser to retrieve the string and convert it to a picture

Save the picture's S3 key in an Amazon DynamoDB table. Use a function to generate a presigned URL every time an employee logs in. Return the URL to the browser.

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Question # 52

An application is using single -node Amazon ElastiCache for Redis instance to improve read performance. Over time, demand for the application has increased exponentially, which has increased the load on the ElastiCache instance. It is critical that this cache layer handles the load and is resilient in case of node failures.

What can the Developer do to address the load and resiliency requirements?

Add a read replica instance.

Migrate to a Memcached cluster.

Migrate to an Amazon ElastiCache service cluster.

Vertically scale the ElastiCache instance.

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Question # 53

A Developer is trying to make API calls using SDK. The IAM user credentials used by the application require multi-factor authentication for all API calls.

Which method the Developer use to access the multi-factor authentication protected API?

GetFederationToken

GetCallerIdentity

GetSessionToken

DecodeAutherizationMessage

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Question # 54

A software engineer developed an AWS Lambda function in Node.js to do some CPU-intensive data processing. With the default settings, the Lambda function takes about 5 minutes to complete.

Which approach should a developer take to increase the speed of completion''

Instead of using Node js. rewrite the Lambda function using Python

Instead of packaging the libraries in the ZIP file with the function move them to a Lambda layer and use the layer with the function.

Allocate the maximum available CPU units lo the function

Increase the available memory to the function.

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Question # 55

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 scripts 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 dayâ€™s table.

Add an attribute with the expiration time; name the attribute ItemExpiration.

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