A company wants to migrate its web application to AWS and leverage Auto Scaling to handle pear workloads.
The Solutions Architect determined that the best metric for an Auto Scaling event is the number of concurrent users.
Based on this information, what should the Developer use to autoscale based on concurrent users?

• A.A Custom Amazon CloudWatch metric for concurrent users.
• B.An Amazon SNS topic to be triggered when a concurrent user threshold is met
• C.An Amazon Cloudwatch Networkin metric
• D.Amazon CloudFront to leverage AWS Edge Locations

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A developer receives the following error message when trying to launch or terminate an Amazon EC2 instance using a boto3 script.

What should the developer do to correct this error message?

• A.Implement an exponential backoff algorithm for optimizing the number of API requests made to Amazon EC2.
• B.Increase the overall network bandwidth to handle higher API request rates.
• C.Upgrade to the latest AWS CLI version so that boto3 can handle higher request rates
• D.Assign an IAM role to the EC2 instance to allow necessary API calls on behalf of the client.

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A Developer is building a three-tier web application that should be able to handle a minimum of 5000 requests per minute. Requirements state that the web tier should be completely stateless while the application maintains session state for the users.
How can session data be externalized, keeping latency at the LOWEST possible value?

• A.Create an Amazon RDS instance, then implement session handling at the application level to leverage a database inside the RDS database instance for session data storage
• B.Create an Amazon DynamoDB table, then implement session handling at the application level to leverage the table for session data storage
• C.Implement a shared file system solution across the underlying Amazon EC2 instances, then implement session handling at the application level to leverage the shared file system for session data storage
• D.Create an Amazon ElastiCache Memcached cluster, then implement session handling at the application level to leverage the cluster for session data storage

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A development team uses AWS Elastic Beanstalk to deploy a Java-based web application. The team wants to ensure that the changes to the source code and the configuration are always deployed on new instances The team configures the Elastic Beanstalk environment to use immutable updates. However an error occurs the first time a change is deployed with the new update policy
What is the MOST likely cause of this issue?

• A.Immutable updates are only supported for m4 large and larger instance types.
• B.The account has reached its on-demand instance limit
• C.Immutable updates are not supported for Java-based applications
• D.The developer must also modify the ebextensions/immutable-updates config file to enable immutable updates

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A nightly batch job loads 1 million new records into a DynamoDB table. The records are only needed for one hour, and the table needs to be empty by the next night's batch job.
Which is the MOST efficient and cost-effective method to provide an empty table?

• A.Use DeleteItem using a ConditionExpression.
• B.Use BatchWriteItem to empty all of the rows.
• C.With a recursive function that scans and calls out DeleteItem.
• D.Create and then delete the table after the task has completed.

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