- (Exam Topic 2)
A company wants to use the AWS Cloud to make an existing application highly available and resilient. The current version of the application resides in the company's data center. The application recently experienced data loss after a database server crashed because of an unexpected power outage.
The company needs a solution that avoids any single points of failure. The solution must give the application the ability to scale to meet user demand.
Which solution will meet these requirements?

1. A. Deploy the application servers by using Amazon EC2 instances in an Auto Scaling group across multiple Availability Zone
2. B. Use an Amazon RDS DB instance in a Multi-AZ configuration.
3. C. Deploy the application servers by using Amazon EC2 instances in an Auto Scaling group in a single Availability Zon
4. D. Deploy the databaseon an EC2 instanc
5. E. Enable EC2 Auto Recovery.
6. F. Deploy the application servers by using Amazon EC2 instances in an Auto Scaling group across multiple Availability Zone
7. G. Use an Amazon RDS DB instance with a read replica in a single Availability Zon
8. H. Promote the read replica to replace the primary DB instance if the primary DB instance fails.
9. I. Deploy the application servers by using Amazon EC2 instances in an Auto Scaling group across multiple Availability Zones Deploy the primary and secondary database servers on EC2 instances across multiple Availability Zones Use Amazon Elastic Block Store (Amazon EBS) Multi-Attach to create shared storage between the instances.

Correct Answer: A

- (Exam Topic 2)
A company has two applications: a sender application that sends messages with payloads to be processed and a processing application intended to receive the messages with payloads. The company wants to implement an AWS service to handle messages between the two applications. The sender application can send about 1.000 messages each hour. The messages may take up to 2 days to be processed. If the messages fail to process, they must be retained so that they do not impact the processing of any remaining messages.
Which solution meets these requirements and is the MOST operationally efficient?

1. A. Set up an Amazon EC2 instance running a Redis databas
2. B. Configure both applications to use the instanc
3. C. Store, process, and delete the messages, respectively.
4. D. Use an Amazon Kinesis data stream to receive the messages from the sender applicatio
5. E. Integrate the processing application with the Kinesis Client Library (KCL).
6. F. Integrate the sender and processor applications with an Amazon Simple Queue Service (Amazon SQS) queu
7. G. Configure a dead-letter queue to collect the messages that failed to process.
8. H. Subscribe the processing application to an Amazon Simple Notification Service (Amazon SNS) topic to receive notifications to proces
9. I. Integrate the sender application to write to the SNS topic.

Correct Answer: C
https://aws.amazon.com/blogs/compute/building-loosely-coupled-scalable-c-applications-with-amazon-sqs-and- https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-dead-letter-queues.htm

- (Exam Topic 1)
A company's application integrates with multiple software-as-a-service (SaaS) sources for data collection. The company runs Amazon EC2 instances to receive the data and to upload the data to an Amazon S3 bucket for analysis. The same EC2 instance that receives and uploads the data also sends a notification to the user when an upload is complete. The company has noticed slow application performance and wants to improve the performance as much as possible.
Which solution will meet these requirements with the LEAST operational overhead?

1. A. Create an Auto Scaling group so that EC2 instances can scale ou
2. B. Configure an S3 event notification to send events to an Amazon Simple Notification Service (Amazon SNS) topic when the upload to the S3 bucket is complete.
3. C. Create an Amazon AppFlow flow to transfer data between each SaaS source and the S3 bucket.Configure an S3 event notification to send events to an Amazon Simple Notification Service (Amazon SNS) topic when the upload to the S3 bucket is complete.
4. D. Create an Amazon EventBridge (Amazon CloudWatch Events) rule for each SaaS source to send output dat
5. E. Configure the S3 bucket as the rule's targe
6. F. Create a second EventBridge (CloudWatch Events) rule to send events when the upload to the S3 bucket is complet
7. G. Configure an Amazon Simple Notification Service (Amazon SNS) topic as the second rule's target.
8. H. Create a Docker container to use instead of an EC2 instanc
9. I. Host the containerized application on Amazon Elastic Container Service (Amazon ECS). Configure Amazon CloudWatch Container Insights to send events to an Amazon Simple Notification Service (Amazon SNS) topic when the upload to the S3 bucket is complete.

Correct Answer: B
Amazon AppFlow is a fully managed integration service that enables you to securely transfer data between Software-as-a-Service (SaaS) applications like Salesforce, SAP, Zendesk, Slack, and ServiceNow, and AWS services like Amazon S3 and Amazon Redshift, in just a few clicks. https://aws.amazon.com/appflow/

- (Exam Topic 1)
A company is planning to use an Amazon DynamoDB table for data storage. The company is concerned about cost optimization. The table will not be used on most mornings. In the evenings, the read and write traffic will often be unpredictable. When traffic spikes occur, they will happen very quickly.
What should a solutions architect recommend?

1. A. Create a DynamoDB table in on-demand capacity mode.
2. B. Create a DynamoDB table with a global secondary index.
3. C. Create a DynamoDB table with provisioned capacity and auto scaling.
4. D. Create a DynamoDB table in provisioned capacity mode, and configure it as a global table.

Correct Answer: A

- (Exam Topic 3)
A company is hosting a three-tier ecommerce application in the AWS Cloud. The company hosts the website on Amazon S3 and integrates the website with an API that handles sales requests. The company hosts the API on three Amazon EC2 instances behind an Application Load Balancer (ALB). The API consists of static and dynamic front-end content along with backend workers that process sales requests asynchronously.
The company is expecting a significant and sudden increase in the number of sales requests during events for the launch of new products
What should a solutions architect recommend to ensure that all the requests are processed successfully?

1. A. Add an Amazon CloudFront distribution for the dynamic conten
2. B. Increase the number of EC2 instances to handle the increase in traffic.
3. C. Add an Amazon CloudFront distribution for the static conten
4. D. Place the EC2 instances in an Auto Scaling group to launch new instances based on network traffic.
5. E. Add an Amazon CloudFront distribution for the dynamic conten
6. F. Add an Amazon ElastiCache instance in front of the ALB to reduce traffic for the API to handle.
7. G. Add an Amazon CloudFront distribution for the static conten
8. H. Add an Amazon Simple Queue Service (Amazon SOS) queue to receive requests from the website for later processing by the EC2 instances.

Correct Answer: D