QUESTION: 261

A solutions architect needs to review the design of an Amazon EMR cluster that is using the EMR File System (EMRFS). The cluster performs tasks that are critical to business needs. The cluster is running Amazon EC2 On-Demand Instances at all times for all task, primary, and core nodes. The EMR tasks run each morning, starting at 1:00 AM. and take 6 hours to finish running. The amount of time to complete the processing is not a priority because the data is not referenced until late in the day.

The solutions architect must review the architecture and suggest a solution to minimize the compute costs.

Which solution should the solutions architect recommend to meet these requirements?

Launch all task, primary, and core nodes on Spot Instances in an instance fleet. Terminate the cluster, including all instances, when the processing is completed.
Launch the primary and core nodes on On-Demand Instances. Launch the task nodes on Spot Instances in an instance fleet. Terminate the cluster, including all instances, when the processing is completed. Purchase Compute Savings Plans to cover the On-Demand Instance usage.
Continue to launch all nodes on On-Demand Instances. Terminate the cluster, including all instances, when the processing is completed. Purchase Compute Savings Plans to cover the On-Demand Instance usage.
Launch the primary and core nodes on On-Demand Instances. Launch the task nodes on Spot Instances in an instance fleet. Terminate only the task node instances when the processing is completed. Purchase Compute Savings Plans to cover the On-Demand Instance usage.

Answer(s): C

Explanation:

C) Continuing to use On-Demand Instances for all nodes ensures reliability for the business-critical EMR tasks. Terminating the cluster when processing is complete further optimizes cost, as resources are only used when necessary. Purchasing Compute Savings Plans for the On-Demand Instance usage will provide long-term cost savings while maintaining the same architecture, meeting both the reliability and cost-efficiency requirements. This option minimizes compute costs without compromising the stability of the workload.

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QUESTION: 262

A company has migrated a legacy application to the AWS Cloud. The application runs on three Amazon EC2 instances that are spread across three Availability Zones. One EC2 instance is in each Availability Zone. The EC2 instances are running in three private subnets of the VPC and are set up as targets for an Application Load Balancer (ALB) that is associated with three public subnets.

The application needs to communicate with on-premises systems. Only traffic from IP addresses in the company's IP address range are allowed to access the on-premises systems. The company’s security team is bringing only one IP address from its internal IP address range to the cloud. The company has added this IP address to the allow list for the company firewall. The company also has created an Elastic IP address for this IP address.

A solutions architect needs to create a solution that gives the application the ability to communicate with the on-premises systems. The solution also must be able to mitigate failures automatically.

Which solution will meet these requirements?

Deploy three NAT gateways, one in each public subnet. Assign the Elastic IP address to the NAT gateways. Turn on health checks for the NAT gateways. If a NAT gateway fails a health check, recreate the NAT gateway and assign the Elastic IP address to the new NAT gateway.
Replace the ALB with a Network Load Balancer (NLB). Assign the Elastic IP address to the NLTurn on health checks for the NLIn the case of a failed health check, redeploy the NLB in different subnets.
Deploy a single NAT gateway in a public subnet. Assign the Elastic IP address to the NAT gateway. Use Amazon CloudWatch with a custom metric to monitor the NAT gateway. If the NAT gateway is unhealthy, invoke an AWS Lambda function to create a new NAT gateway in a different subnet. Assign the Elastic IP address to the new NAT gateway.
Assign the Elastic IP address to the ALB. Create an Amazon Route 53 simple record with the Elastic IP address as the value. Create a Route 53 health check. In the case of a failed health check, recreate the ALB in different subnets.

Answer(s): C

Explanation:

C) Deploying a single NAT gateway with the Elastic IP address in a public subnet allows traffic from the private EC2 instances to communicate with on-premises systems. Using Amazon CloudWatch to monitor the NAT gateway's health ensures that failures are detected. If the NAT gateway becomes unhealthy, an AWS Lambda function can automatically create a new NAT gateway in a different subnet and reassign the Elastic IP address, ensuring high availability and mitigating failures without manual intervention. This solution meets the requirement for fault tolerance and automatic failover.

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QUESTION: 263

A company uses AWS Organizations to manage more than 1,000 AWS accounts. The company has created a new developer organization. There are 540 developer member accounts that must be moved to the new developer organization. All accounts are set up with all the required information so that each account can be operated as a standalone account.

Which combination of steps should a solutions architect take to move all of the developer accounts to the new developer organization? (Choose three.)

Call the MoveAccount operation in the Organizations API from the old organization's management account to migrate the developer accounts to the new developer organization.
From the management account, remove each developer account from the old organization using the RemoveAccountFromOrganization operation in the Organizations API.
From each developer account, remove the account from the old organization using the RemoveAccountFromOrganization operation in the Organizations API.
Sign in to the new developer organization's management account and create a placeholder member account that acts as a target for the developer account migration.
Call the InviteAccountToOrganization operation in the Organizations API from the new developer organization's management account to send invitations to the developer accounts.
Have each developer sign in to their account and confirm to join the new developer organization.

Answer(s): B,E,F

Explanation:

B) To move the developer accounts to the new developer organization, the accounts need to be removed from the old organization. This can be done by using the RemoveAccountFromOrganization operation in the old organization's management account.
E) The new organization’s management account must send invitations to the developer accounts to join the new organization. This can be done using the InviteAccountToOrganization operation.
F) After the invitations are sent, each developer must sign in to their account and confirm the invitation to join the new developer organization. This ensures that the accounts are successfully transferred to the new organization.
This combination of steps ensures a smooth transfer of developer accounts between organizations in AWS Organizations.

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QUESTION: 264

A company’s interactive web application uses an Amazon CloudFront distribution to serve images from an Amazon S3 bucket. Occasionally, third-party tools ingest corrupted images into the S3 bucket. This image corruption causes a poor user experience in the application later. The company has successfully implemented and tested Python logic to detect corrupt images.

A solutions architect must recommend a solution to integrate the detection logic with minimal latency between the ingestion and serving.

Which solution will meet these requirements?

Use a Lambda@Edge function that is invoked by a viewer-response event.
Use a Lambda@Edge function that is invoked by an origin-response event.
Use an S3 event notification that invokes an AWS Lambda function.
Use an S3 event notification that invokes an AWS Step Functions state machine.

Answer(s): C

Explanation:

C) Using an S3 event notification that invokes an AWS Lambda function ensures that the detection logic is applied as soon as images are ingested into the S3 bucket. This solution introduces minimal latency, as the Lambda function can immediately detect and handle corrupted images upon ingestion. This approach also integrates smoothly with the existing logic and ensures that only valid images are served through the CloudFront distribution, improving the user experience without additional complexity or delay.

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QUESTION: 261

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QUESTION: 262

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QUESTION: 263

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QUESTION: 264

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