- (Exam Topic 3)
A company uses a payment processing system that requires messages for a particular payment ID to be received in the same order that they were sent Otherwise, the payments might be processed incorrectly.
Which actions should a solutions architect take to meet this requirement? (Select TWO.)

1. A. Write the messages to an Amazon DynamoDB table with the payment ID as the partition key
2. B. Write the messages to an Amazon Kinesis data stream with the payment ID as the partition key.
3. C. Write the messages to an Amazon ElastiCache for Memcached cluster with the payment ID as the key
4. D. Write the messages to an Amazon Simple Queue Service (Amazon SQS) queue Set the message attribute to use the payment ID
5. E. Write the messages to an Amazon Simple Queue Service (Amazon SQS) FIFO queu
6. F. Set the message group to use the payment ID.

Correct Answer: AE

- (Exam Topic 3)
A company deploys an appliation on five Amazon EC2 instances. An Applicatin Load Balancer (ALB) distributes traffic to the instances by using a target group. The average CPU usage on each of the insatances is below 10% most of the time. With occasional surges to 65%.
A solution architect needs to implement a solution to automate the scalability of the application. The solution must optimize the cost of the architecture and must ensure that the application has enough CPU resources when surges occur.
Which solution will meet these requirements?

1. A. Create an Amazon CloudWatch alarm that enters the ALARM state when the CPUUtilization metric is less than 20%. Create an AWS Lambda function that the CloudWatch alarm invokes to terminate one ofthe EC2 instances in the ALB target group.
2. B. Create an EC2 Auto Scalin
3. C. Select the exisiting ALB as the load balancer and the existing target group as the target grou
4. D. Set a target tracking scaling policy that is based on the ASGAverageCPUUtilization metri
5. E. Set the minimum instances to 2, the desired capacity to 3, the desired capacity to 3, the maximum instances to 6, and the target value to 50%. And the EC2 instances to the Auto Scaling group.
6. F. Create an EC2 Auto Scalin
7. G. Select the exisiting ALB as the load balancer and the existing target group.Set the minimum instances to 2, the desired capacity to 3, and the maximum instances to 6 Add the EC2 instances to the Scaling group.
8. H. Create two Amazon CloudWatch alarm
9. I. Configure the first CloudWatch alarm to enter the ALARM satet when the average CPUTUilization metric is below 20%. Configure the seconnd CloudWatch alarm to enter the ALARM state when the average CPUUtilization metric is aboove 50%. Configure the alarms to publish to an Amazon Simple Notification Service (Amazon SNS) topic to send an email messag
10. J. After receiving the message, log in to decrease or increase the number of EC2 instances that are running

Correct Answer: B

- (Exam Topic 1)
A company collects temperature, humidity, and atmospheric pressure data in cities across multiple continents. The average volume of data collected per site each day is 500 GB. Each site has a high-speed internet connection. The company's weather forecasting applications are based in a single Region and analyze the data daily.
What is the FASTEST way to aggregate data from all of these global sites?

1. A. Enable Amazon S3 Transfer Acceleration on the destination bucke
2. B. Use multipart uploads to directly upload site data to the destination bucket.
3. C. Upload site data to an Amazon S3 bucket in the closest AWS Regio
4. D. Use S3 cross-Region replication to copy objects to the destination bucket.
5. E. Schedule AWS Snowball jobs daily to transfer data to the closest AWS Regio
6. F. Use S3 cross-Region replication to copy objects to the destination bucket.
7. G. Upload the data to an Amazon EC2 instance in the closest Regio
8. H. Store the data in an Amazon Elastic Block Store (Amazon EBS) volum
9. I. Once a day take an EBS snapshot and copy it to the centralized Regio
10. J. Restore the EBS volume in the centralized Region and run an analysis on the data daily.

Correct Answer: A
You might want to use Transfer Acceleration on a bucket for various reasons, including the following: You have customers that upload to a centralized bucket from all over the world.
You transfer gigabytes to terabytes of data on a regular basis across continents.
You are unable to utilize all of your available bandwidth over the Internet when uploading to Amazon S3. https://docs.aws.amazon.com/AmazonS3/latest/dev/transfer-acceleration.html https://aws.amazon.com/s3/transfer-acceleration/#:~:text=S3%20Transfer%20Acceleration%20(S3TA)%20redu "Amazon S3 Transfer Acceleration can speed up content transfers to and from Amazon S3 by as much as 50-500% for long-distance transfer of larger objects. Customers who have either web or mobile applications with widespread users or applications hosted far away from their S3 bucket can experience long and variable upload and download speeds over the Internet"
https://docs.aws.amazon.com/AmazonS3/latest/userguide/mpuoverview.html "Improved throughput - You can upload parts in parallel to improve throughput."

- (Exam Topic 1)
A company is preparing to deploy a new serverless workload. A solutions architect must use the principle of least privilege to configure permissions that will be used to run an AWS Lambda function. An Amazon EventBridge (Amazon CloudWatch Events) rule will invoke the function.
Which solution meets these requirements?

1. A. Add an execution role to the function with lambda:InvokeFunction as the action and * as the principal.
2. B. Add an execution role to the function with lambda:InvokeFunction as the action and Service:amazonaws.com as the principal.
3. C. Add a resource-based policy to the function with lambda:'* as the action and Service:events.amazonaws.com as the principal.
4. D. Add a resource-based policy to the function with lambda:InvokeFunction as the action and Service:events.amazonaws.com as the principal.

Correct Answer: D
https://docs.aws.amazon.com/eventbridge/latest/userguide/resource-based-policies-eventbridge.html#lambda-pe

- (Exam Topic 1)
A company runs an ecommerce application on Amazon EC2 instances behind an Application Load Balancer. The instances run in an Amazon EC2 Auto Scaling group across multiple Availability Zones. The Auto Scaling group scales based on CPU utilization metrics. The ecommerce application stores the transaction data in a MySQL 8.0 database that is hosted on a large EC2 instance.
The database's performance degrades quickly as application load increases. The application handles more read requests than write transactions. The company wants a solution that will automatically scale the database to meet the demand of unpredictable read workloads while maintaining high availability.
Which solution will meet these requirements?

1. A. Use Amazon Redshift with a single node for leader and compute functionality.
2. B. Use Amazon RDS with a Single-AZ deployment Configure Amazon RDS to add reader instances in a different Availability Zone.
3. C. Use Amazon Aurora with a Multi-AZ deploymen
4. D. Configure Aurora Auto Scaling with Aurora Replicas.
5. E. Use Amazon ElastiCache for Memcached with EC2 Spot Instances.

Correct Answer: C
AURORA is 5x performance improvement over MySQL on RDS and handles more read requests than write,; maintaining high availability = Multi-AZ deployment