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[General] Amazon AWS-Developer exam questions & answers, AWS-Developer real exams

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【General】 Amazon AWS-Developer exam questions & answers, AWS-Developer real exams

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Amazon AWS Certified Developer Associate Exam (DVA-C02) Sample Questions (Q149-Q154):NEW QUESTION # 149
A development team uses AWS Elastic Beanstalk for application deployment. The team has configured the application version lifecycle policy to limit the number of application versions to 25.
However, even with the lifecycle policy, the source bundle is deleted from the Amazon S3 source bucket.
What should a developer do in the Elastic Beanstalk application version lifecycle settings to retain the source code in the S3 bucket?
  • A. Set Retention to Retain source bundle in S3.
  • B. Change the Set the application versions limit by total count setting to zero.
  • C. Disable the Lifecycle policy setting.
  • D. Change the Set the application version limit by age setting to zero.
Answer: A
Explanation:
https://digitalcloud.training/ce ... /elastic-beanstalk/

NEW QUESTION # 150
In Amazon SNS, to send push notifications to mobile devices using Amazon SNS and ADM, you need to obtain the following, except:
  • A. Client ID
  • B. Client secret
  • C. Device token
  • D. Registration ID
Answer: C
Explanation:
To send push notifications to mobile devices using Amazon SNS and ADM, you need to obtain the following: Registration ID and Client secret.
http://docs.aws.amazon.com/sns/latest/dg/SNSMobilePushPrereq.html

NEW QUESTION # 151
A Developer is designing a fault-tolerant environment where client sessions will be saved.
How can the Developer ensure that no sessions are lost if an Amazon EC2 instance fails?
  • A. Use Amazon DynamoDB to perform scalable session hadling.
  • B. Use Elastic Load Balancer connection draining to stop sending requests to failing instances.
  • C. Use sticky sessions with an Elastic Load Balancer target group.
  • D. Use Amazon SQS to save session data.
Answer: A
Explanation:
The key word is fault-tolerant. With sticky sessions the state is maintained on the EC2 instance if that fails state is lost. With DynamoDB the state is independent of EC2 therefore fault-tolerant.

NEW QUESTION # 152
A developer is migrating some features from a legacy monolithic application to use AWS Lambda functions instead. The application currently stores data in an Amazon Aurora DB cluster that runs in private subnets in a VPC. The AWS account has one VPC deployed. The Lambda functions and the DB cluster are deployed in the same AWS Region in the same AWS account.
The developer needs to ensure that the Lambda functions can securely access the DB cluster without crossing the public internet.
Which solution will meet these requirements?
  • A. Configure a NAT gateway and a security group for the Lambda functions.
  • B. Configure an Amazon RDS database proxy for the Lambda functions.
  • C. Configure the DB cluster's public access setting to Yes.
  • D. Configure the VPC, subnets, and a security group for the Lambda functions.
Answer: D
Explanation:
This solution will meet the requirements by allowing the Lambda functions to access the DB cluster securely within the same VPC without crossing the public internet. The developer can configure a VPC endpoint for RDS in a private subnet and assign it to the Lambda functions. The developer can also configure a security group for the Lambda functions that allows inbound traffic from the DB cluster on port 3306 (MySQL).
Option A is not optimal because it will expose the DB cluster to public access, which may compromise its security and data integrity. Option B is not optimal because it will introduce additional latency and complexity to use an RDS database proxy for accessing the DB cluster from Lambda functions within the same VPC. Option C is not optimal because it will require additional costs and configuration to use a NAT gateway for accessing resources in private subnets from Lambda functions.
References: [Configuring a Lambda Function to Access Resources in a VPC]

NEW QUESTION # 153
A Developer has implemented a Lambda function that needs to add new customers to an RDS database that is expected to run hundreds of times per hour. The Lambda function is configured to use 512MB of RAM and is based on the following pseudo code:

After testing the Lambda function, the Developer notices that the Lambda execution time is much longer than expected. What should the Developer do to improve performance?
  • A. Increase the amount of RAM allocated to the Lambda function, which will increase the number of threads the Lambda can use.
  • B. Increase the size of the RDS database to allow for an increased number of database connections each hour.
  • C. Move the database connection and close statement out of the handler. Place the connection in the global space.
  • D. Replace RDS wit Amazon DynamoDB to implement control over the number of writes per second.
Answer: C

NEW QUESTION # 154
......
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