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NEW QUESTION 21
A Developer is developing an application that manages financial transactions. To improve security, multi-factor authentication (MFA) will be required as part of the login protocol.
What services can the Developer use to meet these requirements?

• A. AWS IAM with MFA enabled
• B. Amazon DynamoDB to store MFA session data, and Amazon SNS to send MFA codes
• C. Amazon Cognito with MFA
• D. AWS Directory Service

Answer: C

Explanation:
Explanation
AWS documentation - Cognito MFA Managing Security
You can add multi-factor authentication (MFA) to a user pool to protect the identity of your users. MFA adds a second authentication method that doesn't rely solely on user name and password. You can choose to use SMS text messages, or time-based one-time (TOTP) passwords as second factors in signing in your users. You can also use adaptive authentication with its risk-based model to predict when you might need another authentication factor. It's part of the user pool advanced security features, which also include protections against compromised credentials.

NEW QUESTION 22
A company has a three-tier application that is deployed in Amazon Elastic Container Service (Amazon ECS).
The application is using an Amazon RDS for MySQL DB Instance The application performs more database reads than writes.
During times of peak usage. the application's performance degrades. When this performance degradation occurs, the DB instance's ReadLatency metric in Amazon CloudWatch increases suddenly How should a developer modify the application to improve performance?

• A. Use Amazon ElastiCache to cache query results
• B. Add read capacity units (RCUs) to the DB instance.
• C. Modify the ECS task definition to increase the task memory
• D. Scale the ECS cluster to contain more ECS instances

Answer: A

NEW QUESTION 23
An application is experiencing performance issues based on increased demand. This increased demand is on read-only historical records pulled from an Amazon RDS-hosted database with custom views and queries. A developer improve performance without changing the database structure.
Which approach will improve performance and MINIMIZE management overhead?

• A. Deploy Amazon ElasticCache for Redis and cache the data for the application.
• B. Deploy Amazon DynamoDB Accelerator (DAX) on Amazon RDS to improve cache performance
• C. Deploy Memcached on Amazon EC2 and cache the data for the application.
• D. Deploy Amazon DynamoDB, move all the data, and point to DynamoDB.

Answer: A

NEW QUESTION 24
A Developer has been asked to make changes to the source code of an AWS Lambda function. The function is managed using an AWS CloudFormation template. The template is configured to load the source code from an Amazon S3 bucket. The Developer manually created a .ZIP file deployment package containing the changes and put the file into the correct location on Amazon S3. When the function is invoked, the code changes have not been applied.
What step is required to update the function with the changes?

• A. Update the CloudFormation stack with the correct values for the function code properties S3Bucket, S3Key, or S3ObjectVersion.
• B. Delete the .ZIP file on S3, and re-upload by using a different object key name.
• C. Modify the execution role of the Lambda function to allow S3 access permission to the deployment package .ZIP file.
• D. Ensure that the function source code is base64-encoded before uploading the deployment package to S3.

Answer: C

NEW QUESTION 25
An application stops working with the following error: The specified bucket does not exist. Where is the BEST place to start the root cause analysis?

• A. Check the Elastic Load Balancer logs for DeleteBucket requests.
• B. Check AWS CloudTrail for a DeleteBucket event.
• C. Check AWS X-Ray for Amazon S3 DeleteBucket alarms.
• D. Check the application logs in Amazon CloudWatch Logs for Amazon S3 DeleteBucket errors.

Answer: B

Explanation:
https://github.com/serverless/serverless-graphql/issues/72

NEW QUESTION 26
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