AWS Certified Security – Specialty (SCS-C02) — Question 211

A company has a requirement that no Amazon EC2 security group can allow SSH access from the CIDR block 0.0.0.0/0. The company wants to monitor compliance with this requirement at all times and wants to receive a near-real-time notification if any security group is noncompliant.

A security engineer has configured AWS Config and will use the restricted-ssh managed rule to monitor the security groups.

What should the security engineer do next to meet these requirements?

Answer options

• A. Configure AWS Config to send its configuration snapshots to an Amazon S3 bucket. Create an AWS Lambda function to run on a PutEvent to the S3 bucket. Configure the Lambda function to parse the snapshot for a compliance change to the restricted-ssh managed rule. Configure the Lambda function to send a notification to an Amazon Simple Notification Service (Amazon SNS) topic if a change is discovered.
• B. Configure an Amazon EventBridge event rule that is invoked by a compliance change event from AWS Config for the restricted-ssh managed rule. Configure the event rule to target an Amazon Simple Notification Service (Amazon SNS) topic that will provide a notification.
• C. Configure AWS Config to push all its compliance notifications to Amazon CloudWatch Logs. Configure a CloudWatch Logs metric filter on the AWS Config log group to look for a compliance notification change on the restricted-ssh managed rule. Create an Amazon CloudWatch alarm on the metric filter to send a notification to an Amazon Simple Notification Service (Amazon SNS) topic if the alarm is in the ALARM state.
• D. Configure an Amazon CloudWatch alarm on the CloudWatch metric for the restricted-ssh managed rule. Configure the CloudWatch alarm to send a notification to an Amazon Simple Notification Service (Amazon SNS) topic if the alarm is in the ALARM state.

Correct answer: B

Explanation

The correct answer is B because it directly utilizes Amazon EventBridge to react to compliance changes, providing timely notifications via Amazon SNS. Option A relies on AWS Lambda and S3, which adds unnecessary complexity and latency. Option C involves CloudWatch Logs and metric filters, which may delay notifications. Option D sets up an alarm but does not react to compliance changes in real-time like option B.