- (Exam Topic 1)
A company's financial department needs to view the cost details of each project in an AWS account A SysOps administrator must perform the initial configuration that is required to view cost for each project in Cost Explorer
Which solution will meet this requirement?

1. A. Activate cost allocation tags Add a project tag to the appropriate resources
2. B. Configure consolidated billing Create AWS Cost and Usage Reports
3. C. Use AWS Budgets Create AWS Budgets reports
4. D. Use cost categories to define custom groups that are based on AWS cost and usage dimensions

Correct Answer: A

- (Exam Topic 1)
A SysOps administrator is trying to set up an Amazon Route 53 domain name to route traffic to a website hosted on Amazon S3. The domain name of the website is www.anycompany.com and the S3 bucket name is anycompany-static. After the record set is set up in Route 53, the domain name www.anycompany.com does not seem to work, and the static website is not displayed in the browser.
Which of the following is a cause of this?

1. A. The S3 bucket must be configured with Amazon CloudFront first.
2. B. The Route 53 record set must have an IAM role that allows access to the S3 bucket.
3. C. The Route 53 record set must be in the same region as the S3 bucket.
4. D. The S3 bucket name must match the record set name in Route 53.

Correct Answer: D

- (Exam Topic 1)
A company has two VPC networks named VPC A and VPC B. The VPC A CIDR block is 10.0.0.0/16 and the VPC B CIDR block is 172.31.0.0/16. The company wants to establish a VPC peering connection named
pcx-12345 between both VPCs.
Which rules should appear in the route table of VPC A after configuration? (Select TWO.)

1. A. Destination: 10.0.0.0/16, Target: Local
2. B. Destination: 172.31.0.0/16, Target: Local
3. C. Destination: 10.0.0.0/16, Target: pcx-12345
4. D. Destination: 172.31.0.0/16, Target: pcx-12345
5. E. Destination: 10.0.0.0/16. Target: 172.31.0.0/16

Correct Answer: AD
https://docs.aws.amazon.com/vpc/latest/peering/vpc-peering-routing.html

- (Exam Topic 1)
A user working in the Amazon EC2 console increased the size of an Amazon Elastic Block Store (Amazon EBS) volume attached to an Amazon EC2 Windows instance. The change is not reflected in the file system.
What should a SysOps administrator do to resolve this issue?

1. A. Extend the file system with operating system-level tools to use the new storage capacity.
2. B. Reattach the EBS volume to the EC2 instance.
3. C. Reboot the EC2 instance that is attached to the EBS volume.
4. D. Take a snapshot of the EBS volum
5. E. Replace the original volume with a volume that is created from the snapshot.

Correct Answer: B

- (Exam Topic 1)
A company is running a serverless application on AWS Lambda The application stores data in an Amazon RDS for MySQL DB instance Usage has steadily increased and recently there have been numerous "too many connections" errors when the Lambda function attempts to connect to the database The company already has configured the database to use the maximum max_connections value that is possible
What should a SysOps administrator do to resolve these errors'?

1. A. Create a read replica of the database Use Amazon Route 53 to create a weighted DNS record that contains both databases
2. B. Use Amazon RDS Proxy to create a proxy Update the connection string in the Lambda function
3. C. Increase the value in the max_connect_errors parameter in the parameter group that the database uses
4. D. Update the Lambda function's reserved concurrency to a higher value

Correct Answer: B
https://aws.amazon.com/blogs/compute/using-amazon-rds-proxy-with-aws-lambda/
RDS Proxy acts as an intermediary between your application and an RDS database. RDS Proxy establishes and manages the necessary connection pools to your database so that your application creates fewer database connections. Your Lambda functions interact with RDS Proxy instead of your database instance. It handles the connection pooling necessary for scaling many simultaneous connections created by concurrent Lambda functions. This allows your Lambda applications to reuse existing connections, rather than creating new connections for every function invocation.
Check "Database proxy for Amazon RDS" section in the link to see how RDS proxy help Lambda handle huge connections to RDS MySQL
https://aws.amazon.com/blogs/compute/using-amazon-rds-proxy-with-aws-lambda/