AWS Certified SysOps Administrator – Associate (SOA-C03) — Question 46

A company's security policy requires incoming SSH traffic to be restricted to a defined set of addresses. The company is using an AWS Config rule to check whether security groups allow unrestricted incoming SSH traffic.
A CloudOps engineer discovers a noncompliant resource and fixes the security group manually. The CloudOps engineer wants to automate the remediation of other noncompliant resources.
What is the MOST operationally efficient solution that meets these requirements?

Answer options

• A. Create an Amazon CloudWatch alarm for the AWS Config rule's status metric. Create an AWS Lambda function that can remove the noncompliant rule from the security group. Configure the alarm action to invoke the Lambda function.
• B. Configure an automatic remediation action on the AWS Config rule. Specify the AWS-DisablolncomingSSHOnPort22 remediation action.
• C. Configure an Amazon EventBridge rule for AWS Config configuration item change events. Create an AWS Lambda function that can remove the noncompliant rule from the security group Configure the rule to invoke the Lambda function.
• D. Create an AWS Lambda function that can analyze a security group’s inbound rules to check for unrestricted SSH access. Configure the Lambda function to remove the noncompliant rule from the security group. Configure an Amazon EventBridge rule to invoke the Lambda function every hour.

Correct answer: B

Explanation

The correct answer is B because configuring an automatic remediation action on the AWS Config rule allows for immediate and efficient handling of noncompliant resources without additional setup. Options A and C require more manual intervention and setup of alarms or events, while option D involves unnecessary complexity by checking the rules hourly instead of acting immediately on noncompliance.