10. While troubleshooting a firewall configuration, a technician determines that a 'deny any' policy should be added to the bottom of the ACL. The technician updates the policy, but the new policy causes several company servers to become unreachable. Which of the following actions would prevent this issue?
Answer: B
Testing the policy in a non-production environment before enabling the policy in the production network
Testing the policy in a non-production environment allows the technician to identify and resolve any potential issues before implementation. This step helps ensure that the 'deny any' policy does not inadvertently block essential traffic to company servers.
A) Documenting the new policy in a change request and submitting the request to change management
While documenting changes in a change request is crucial for accountability and tracking, it does not address the immediate concern of ensuring the policy functions correctly. Proper documentation does not mitigate the risk of network disruptions caused by the new policy.
B) Testing the policy in a non-production environment before enabling the policy in the production network
This option is the correct approach as it allows for thorough evaluation of the policy's impact on network traffic without affecting live operations. By testing in a controlled setting, potential issues can be identified and addressed before they disrupt company servers.
C) Disabling any intrusion prevention signatures on the 'deny any' policy prior to enabling the new policy
Disabling intrusion prevention signatures may temporarily address one aspect of network traffic, but it could expose the network to vulnerabilities. This action does not effectively solve the problem of ensuring that legitimate traffic is not blocked by the new policy.
D) Including an 'allow any' policy above the 'deny any' policy
Inclusion of an 'allow any' policy could create significant security risks, as it would permit all traffic before any specific rules are applied. This approach does not adequately address the need to test the policy's impact beforehand and may lead to unauthorized access.
Conclusion
Testing the policy in a non-production environment is essential to prevent disruptions in the production network. This method ensures that any potential issues are identified and resolved before impacting critical services, while the other options either fail to address the core problem or introduce new risks.