A company has deployed an application on AWS Elastic Beanstalk. The application uses Amazon Aurora for the database layer. An Amazon CloudFront distribution serves web requests and includes the Elastic Beanstalk domain name as the origin server. The distribution is configured with an alternate domain name that visitors use when they access the application.
Each week, the company takes the application out of service for routine maintenance. During the time that the application is unavailable, the company wants visitors to receive an informational message instead of a CloudFront error message.
A solutions architect creates an Amazon S3 bucket as the first step in the process.
Which combination of steps should the solutions architect take next to meet the requirements? (Choose three.)

• A.Upload static informational content to the S3 bucket.
• B.Create a new CloudFront distribution. Set the S3 bucket as the origin.
• C.Set the S3 bucket as a second origin in the original CloudFront distribution. Configure the distribution and the S3 bucket to use an origin access identity (OAI).
• D.During the weekly maintenance, edit the default cache behavior to use the S3 origin. Revert the change when the maintenance is complete.
• E.During the weekly maintenance, create a cache behavior for the S3 origin on the new distribution. Set the path pattern to \ Set the precedence to 0. Delete the cache behavior when the maintenance is complete.
• F.During the weekly maintenance, configure Elastic Beanstalk to serve traffic from the S3 bucket.

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Your company has a logging microservice which is used to generate logs when users have entered certain commands in another application. This logging service is implemented via an SQS standard queue that an EC2 instance is listening to. However, you have found that on some occasions, the order of the logs are not maintained. As a result, it becomes harder to use this service to trace users' activities. How should you fix this issue in a simple way?

• A.The wrong order of timestamps is a limitation of SQS, which does not have a fix.
• B.Migrate the whole microservice application to SWF so that the operation sequence is guaranteed.
• C.Convert the existing standard queue into a FIFO queue. Add a deduplication ID for the messages that are sent to the queue.
• D.Delete the existing standard queue and recreate it as a FIFO queue. As a result, the order for the messages to be received is ensured.

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A company is adding a new approved external vendor that only supports IPv6 connectivity. The company's backend systems sit in the private subnet of an Amazon VPC. The company uses a NAT gateway to allow these systems to communicate with external vendors over IPv4. Company policy requires systems that communicate with external vendors use a security group that limits access to only approved external vendors.
The virtual private cloud (VPC) uses the default network ACL.
The Systems Operator successfully assigns IPv6 addresses to each of the backend systems. The Systems Operator also updates the outbound security group to include the IPv6 CIDR of the external vendor (destination). The systems within the VPC are able to ping one another successfully over IPv6. However, these systems are unable to communicate with the external vendor.
What changes are required to enable communication with the external vendor?

• A.Create an egress-only internet gateway. Add a route for destination ::/0 pointing to the gateway.
• B.Create an IPv6 NAT instance. Add a route for destination 0.0.0.0/0 pointing to the NAT instance.
• C.Enable IPv6 on the internet gateway. Add a route for destination 0.0.0.0/0 pointing to the IGW.
• D.Enable IPv6 on the NAT gateway. Add a route for destination ::/0 pointing to the NAT gateway.

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A solutions architect is redesigning a monolithic application to be a loosely coupled application composed of two microservices: Microservice A and Microservice B.
Microservice A places messages in a main Amazon Simple Queue Service (Amazon SQS) queue for Microservice B to consume. When Microservice B fails to process a message after four retries, the message needs to be removed from the queue and stored for further investigation.
What should the solutions architect do to meet these requirements?

• A.Create an SQS queue for failed messages. Configure the SQS queue for failed messages to pull messages from the main SQS queue after the original message has been received four times.
• B.Create an SQS dead-letter queue. Microservice B adds failed messages to that queue after it receives and fails to process the message four times.
• C.Create an SQS queue for failed messages. Microservice A adds failed messages to that queue after Microservice B receives and fails to process the message four times.
• D.Create an SQS dead-letter queue. Configure the main SQS queue to deliver messages to the dead- letter queue after the message has been received four times.

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An organization is setting up a highly scalable application using Elastic Beanstalk.
They are using Elastic Load Balancing (ELB) as well as a Virtual Private Cloud (VPC) with public and private subnets. They have the following requirements:
- All the EC2 instances should have a private IP
- All the EC2 instances should receive data via the ELB's.
Which of these will not be needed in this setup?

• A.Launch the EC2 instances with only the public subnet.
• B.Create routing rules which will route all inbound traffic from ELB to the EC2 instances.
• C.Configure ELB and NAT as a part of the public subnet only.
• D.Create routing rules which will route all outbound traffic from the EC2 instances through NAT.

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