Amazon SOA-C02 Practice Test - Questions Answers, Page 41

To handle the increased message load with minimal operational effort, implementing an Amazon Simple Queue Service (SQS) queue between the frontend and backend is an ideal solution. SQS decouples the frontend and backend by queuing messages, enabling the backend to process messages at its own pace without losing any.

SQS Queue: Acts as a buffer, ensuring messages are not lost if the backend application cannot immediately process them.

Decoupling: With SQS, the frontend can continue sending messages without concern for the backend's processing speed, providing a scalable solution with minimal management requirements.

Low Operational Overhead: SQS is fully managed, reducing the need for infrastructure management.

Several factors can affect the availability of an S3 object through a presigned URL:

Expiration of Presigned URL: A presigned URL is valid only until its specified expiration time. Once expired, it becomes inaccessible.

Invalid Access Key: If the access key of the SysOps administrator who generated the presigned URL is revoked or rotated, the URL will no longer be valid.

Other options like enabling Block Public Access or changing the object ACL to All Users are not necessary for presigned URLs, as these URLs temporarily grant access regardless of public bucket settings.

The most efficient way to enable DNS resolution between the VPC and the on-premises environment is by configuring a Route 53 Resolver outbound endpoint.

Route 53 Resolver Outbound Endpoint: This enables the VPC to forward DNS queries to the on-premises DNS server, which can resolve internal hostnames.

Minimal Maintenance: This solution is scalable and requires minimal ongoing maintenance compared to manual entries or creating and managing a large number of DNS entries manually.

Using AWS Systems Manager to schedule a maintenance window for restarting EC2 instances outside business hours provides a straightforward and automated approach.

AWS Systems Manager Maintenance Window: Allows for daily scheduling, ensuring that restarts occur consistently outside of business hours.

AWS-RestartEC2Instance Runbook: This runbook can be assigned to the maintenance window, automating the reboot process and minimizing manual intervention.

Reduced Disruption: The scheduled restart ensures the application remains operational during business hours.

To correctly route traffic through CloudFront, the CNAME record should point to the CloudFront distribution's domain (dllllllabcdef8.cloudfront.net). This ensures that requests reach CloudFront first, which then forwards them to the S3 bucket as configured.

Correcting the DNS Record: Changing the DNS CNAME record to point to the CloudFront distribution ensures that all requests go through CloudFront, leveraging its caching and content delivery capabilities.

No Need to Modify S3 Bucket: Since CloudFront accesses the S3 origin through its identity, there's no need to disable S3 Block Public Access.

To enable decryption of objects, the role only requires minimal permissions with least privilege:

kms

: Necessary for reading and decrypting the data encrypted with KMS.

kms

: Allows the role to check key properties, confirming it's the correct key for decryption.

kms

: Useful if multiple keys are in use and validation against an alias is needed.

These permissions are sufficient for decryption without granting additional permissions like encryption or key management.

To resolve issues with high disk I/O during the bootstrap process:

Increase EBS Volume IOPS: Higher IOPS allows the EBS volume to handle more input/output operations per second, which is critical for high I/O demands like downloading large Docker images.

Increase EBS Volume Throughput: Boosting throughput allows for faster data transfer rates, which is useful when the workload requires sustained high data throughput during initialization.

Increasing the instance size or changing the instance type is not necessary if the root cause is related specifically to EBS performance. Nitro instances generally provide higher performance and are well-suited for high I/O tasks.

To centrally manage Security Hub across an organization, AWS allows you to delegate a member account as the Security Hub administrator. This enables centralized configuration and security insights without directly using the management account, which is a best practice.

Delegating a Non-Management Account: AWS recommends using a designated Security Hub administrator account (different from the management account) for central security configurations.

Security Hub Central Configuration: Configuring Security Hub in this manner ensures that security findings from all member accounts are consolidated and manageable from the designated administrator account.

Weighted routing in Route 53 allows you to direct a percentage of traffic to different resources by configuring specific weights. For this requirement, you can:

Weighted Routing Policy: This is the most suitable approach for gradually rolling out a new version by controlling traffic distribution.

Weight Configuration: Setting a weight of 80 for the original resource and 20 for the new resource ensures that 80% of the traffic continues to go to the existing version, while 20% is directed to the new version.

Other routing policies, such as failover and multivalue answer, are not intended for traffic distribution based on percentage; they serve different use cases.