Amazon Web Services certleader dva-c02 Reviews Questions by Philip q7 vce pdf

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Exam Name:	AWS Certified Developer - Associate
Exam Code:	DVA-C02 Dumps
Vendor:	Amazon Web Services	Certification:	AWS Certified Associate
Questions:	344 Q&A's	Shared By:	philip

Question 56

A developer needs to migrate an online retail application to AWS to handle an anticipated increase in traffic. The application currently runs on two servers: one server for the web application and another server for the database. The web server renders webpages and manages session state in memory. The database server hosts a MySQL database that contains order details. When traffic to the application is heavy, the memory usage for the web server approaches 100% and the application slows down considerably.

The developer has found that most of the memory increase and performance decrease is related to the load of managing additional user sessions. For the web server migration, the developer will use Amazon EC2 instances with an Auto Scaling group behind an Application Load Balancer.

Which additional set of changes should the developer make to the application to improve the application's performance?

Options:

Use an EC2 instance to host the MySQL database. Store the session data and the application data in the MySQL database.

Use Amazon ElastiCache for Memcached to store and manage the session data. Use an Amazon RDS for MySQL DB instance to store the application data.

Use Amazon ElastiCache for Memcached to store and manage the session data and the application data.

Use the EC2 instance store to manage the session data. Use an Amazon RDS for MySQL DB instance to store the application data.

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Question 57

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?

Options:

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.

Discussion

Question 58

A developer is creating a stock trading application. The developer needs a solution to send text messages to application users to confirmation when a trade has been completed.

The solution must deliver messages in the order a user makes stock trades. The solution must not send duplicate messages.

Which solution will meet these requirements?

Options:

Configure the application to publish messages to an Amazon Data Firehose delivery stream. Configure the delivery stream to have a destination of each user's mobile phone number that is passed in the trade confirmation message.

Create an Amazon Simple Queue Service (Amazon SQS) FIFO queue. Use the SendMessageln API call to send the trade confirmation messages to the queue. Use the SendMessageOut API to send the messages to users by using the information provided in the trade confirmation message.

Configure a pipe in Amazon EventBridge Pipes. Connect the application to the pipe as a source. Configure the pipe to use each user's mobile phone number as a target. Configure the pipe to send incoming events to the users.

Create an Amazon Simple Notification Service (SNS) FIFO topic. Configure the application to use the AWS SDK to publish notifications to the SNS topic to send SMS messages to the users.

Discussion

Question 59

A company has an AWS Step Functions state machine named myStateMachine. The company configured a service role for Step Functions. The developer must ensure that only the myStateMachine state machine can assume the service role.

Options:

"Condition": { "ArnLike": { "aws

":"arn:aws:states:ap-south-1:111111111111:stateMachine

" } }

"Condition": { "ArnLike": { "aws

":"arn:aws:states:ap-south-1:*:stateMachine

" } }