AWS Certified Solutions Architect – Professional — Question 607

A company uses a load balancer to distribute traffic to Amazon EC2 instances in a single Availability Zone. The company is concerned about security and wants a solutions architect to re-architect the solution to meet the following requirements:
✑ Inbound requests must be filtered for common vulnerability attacks.
✑ Rejected requests must be sent to a third-party auditing application.
✑ All resources should be highly available.
Which solution meets these requirements?

Answer options

• A. Configure a Multi-AZ Auto Scaling group using the application's AMI. Create an Application Load Balancer (ALB) and select the previously created Auto Scaling group as the target. Use Amazon Inspector to monitor traffic to the ALB and EC2 instances. Create a web ACL in WAF. Create an AWS WAF using the web ACL and ALB. Use an AWS Lambda function to frequently push the Amazon Inspector report to the third-party auditing application
• B. Configure an Application Load Balancer (ALB) and add the EC2 instances as targets. Create a web ACL in WAF. Create an AWS WAF using the web ACL and ALB name and enable logging with Amazon CloudWatch Logs. Use an AWS Lambda function to frequently push the logs to the third-party auditing application.
• C. Configure an Application Load Balancer (ALB) along with a target group adding the EC2 instances as targets. Create an Amazon Kinesis Data Firehose with the destination of the third-party auditing application. Create a web ACL in WAF. Create an AWS WAF using the web ACL and ALB then enable logging by selecting the Kinesis Data Firehose as the destination. Subscribe to AWS Managed Rules in AWS Marketplace, choosing the WAF as the subscriber.
• D. Configure a Multi-AZ Auto Scaling group using the application's AMI Create an Application Load Balancer (ALB) and select the previously created Auto Scaling group as the target. Create an Amazon Kinesis Data Firehose with a destination of the third-party auditing application. Create a web ACL in WAF. Create an AWS WAF using the web ACL and ALB then enable logging by selecting the Kinesis Data Firehose as the destination. Subscribe to AWS Managed Rules in AWS Marketplace, choosing the WAF as the subscriber.

Correct answer: D

Explanation

Option D is correct because it implements a Multi-AZ Auto Scaling group for high availability, uses an ALB for traffic distribution, and integrates Kinesis Data Firehose to send rejected requests to the auditing application. The other options do not ensure high availability with a Multi-AZ setup or fail to effectively route rejected requests to the auditing application.