Cisco Cyber Security Practice Exam

When a firewall configuration error occurs, what is the best countermeasure to implement?

1. Test inbound and outbound traffic

2. Update firewall firmware

3. Reboot the network

4. Restrict user access

The correct answer is: Test inbound and outbound traffic

Testing inbound and outbound traffic when a firewall configuration error occurs is essential because it allows you to assess the actual behavior of the firewall in relation to the security policies that have been implemented. By actively monitoring and testing the traffic flowing through the firewall, you can identify misconfigurations or unintended blocks that could be causing issues. This process helps ensure that legitimate traffic is allowed while malicious traffic is blocked, thus maintaining the intended security posture. Moreover, this step is critical in understanding the specific nature of the error. For example, if legitimate traffic is being erroneously blocked, testing can reveal the exact conditions or rules that need to be adjusted for proper traffic flow. It also helps in verifying that any recent changes or updates have not introduced new vulnerabilities or issues. While updating firewall firmware, rebooting the network, or restricting user access might be necessary in different contexts, they do not directly address the immediate need to diagnose and understand the specific configuration error. Testing traffic provides the necessary insight to rectify the configuration issue effectively before considering broader measures.