SOA-C02 Exam Dumps - AWS Certified SysOps Administrator - Associate (SOA-C02)

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 secure the S3 bucket and allow access only from CloudFront, the following steps should be taken:

Create an OAI in CloudFront:

In the CloudFront console, create an origin access identity (OAI) and associate it with your CloudFront distribution.

To troubleshoot high CPU utilization during load testing without scaling out, the SysOps administrator should suspend the Launch and Terminate process types in the Auto Scaling group.

Suspending Processes:

Suspending the Launch and Terminate processes will temporarily stop the Auto Scaling group from adding or removing instances, allowing for troubleshooting without automatic scaling interruptions.

This ensures that the root cause of the high CPU utilization can be investigated without the Auto Scaling group launching additional instances.

Steps to Suspend Processes:

Go to the Auto Scaling group in the AWS Management Console.

Select the group and choose the "Suspend Processes" option.

Suspend the Launch and Terminate processes.

After troubleshooting, resume the processes to re-enable scaling.

Content-MD5 Header:

The Content-MD5 header provides an MD5 checksum of the object being uploaded. Amazon S3 uses this checksum to verify the integrity of the object.

Steps:

When uploading an object to S3, calculate the MD5 checksum of the object.

Include the Content-MD5 header with the base64-encoded MD5 checksum value in the upload request.

This ensures that S3 can detect if the object is corrupted during the upload process.

Step-by-Step Explanation:

Understand the Problem:

An I/O intensive application on an Amazon EC2 general purpose instance is experiencing performance issues.

Users report delays or failures during intensive read/write operations.

The VolumeQueueLength metric is consistently high during these periods.

Analyze the Requirements:

Address the high VolumeQueueLength, which indicates that the EBS volume is unable to handle the I/O requests efficiently.

Improve the disk I/O performance to restore full application performance.

Evaluate the Options:

Option A: Modify the instance type to be storage optimized.

Storage optimized instances are designed for workloads that require high, sequential read and write access to large data sets on local storage.

This could help, but if the issue is primarily with EBS volume performance, increasing IOPS would be a more direct solution.

Option B: Modify the volume properties by deselecting Auto-Enable Volume I/O.

Auto-Enable Volume I/O is a setting that automatically enables I/O for the EBS volume after an event such as a snapshot restore.

Deselecting this option will not address the issue of high I/O demand.

Option C: Modify the volume properties to increase the IOPS.

Increasing the IOPS (Input/Output Operations Per Second) will directly address the high VolumeQueueLength by allowing the volume to handle more I/O operations concurrently.

This is the most effective and direct solution to improve the performance of I/O intensive tasks.

Option D: Modify the instance to enable enhanced networking.

Enhanced networking provides higher bandwidth, higher packet per second (PPS) performance, and consistently lower inter-instance latencies.

While beneficial for network performance, this does not directly impact the EBS volume’s I/O performance.

Select the Best Solution:

Option C: Modifying the volume properties to increase the IOPS directly addresses the high VolumeQueueLength and improves the EBS volume's ability to handle intensive read/write operations.

References:

Amazon EBS Volume Types

Amazon EBS Volume Performance

Optimizing EBS Performance

Increasing the IOPS of the EBS volume ensures that the application can handle the required intensive read/write operations more efficiently, directly addressing the high VolumeQueueLength and restoring full performance.