Question 220
At Northgate Telecom, the network security operations team administers FortiGate-based protection for a multi-region subscriber service network under requirements for continuous secure intersite connectivity and policy traceability. Following the approved change, the team must validate: Two trusted LAN subnets share a zone and a rule unintentionally grants them broad access to one another despite a segmentation requirement. Which observed outcome BEST demonstrates that the intended correction works?
Explanation
Correct Answer
A test from an approved source reaches only its intended service while lateral traffic to restricted subnets is blocked. This outcome validates the intended correction for: Two trusted LAN subnets share a zone and a rule unintentionally grants them broad access to one another despite a segmentation requirement. The associated approved corrective action is: Use appropriate zone membership and intra-zone handling with explicit inter-segment firewall policies rather than assuming zone names provide isolation. The Northgate Telecom reviewer can therefore distinguish observable protection from an untested configuration claim.
Incorrect Answers
A controlled session matches the right firewall policy and the centrally defined translated source address in session diagnostics. This would verify a separate corrective action: Configure and validate the applicable central SNAT map independently of the policy's allow decision. That separate change addresses: A FortiGate configuration uses central SNAT but an engineer expects an individual firewall-policy NAT toggle to determine outgoing translation. It does not validate the current Northgate Telecom issue: Two trusted LAN subnets share a zone and a rule unintentionally grants them broad access to one another despite a segmentation requirement. The relevant acceptance evidence is: A test from an approved source reaches only its intended service while lateral traffic to restricted subnets is blocked.
The known member matches the expected authentication group and a user outside that group remains denied on the same destination. This would verify a separate corrective action: Correct the identity group's remote group filter or matching rule instead of enlarging the application firewall policy. That separate change addresses: FortiGate user authentication succeeds for a remote user but the firewall never matches the intended group because directory membership is misconfigured. It does not validate the current Northgate Telecom issue: Two trusted LAN subnets share a zone and a rule unintentionally grants them broad access to one another despite a segmentation requirement. The relevant acceptance evidence is: A test from an approved source reaches only its intended service while lateral traffic to restricted subnets is blocked.
A revoked test account cannot establish a new permitted session and existing authorization expires or is invalidated as documented. This would verify a separate corrective action: Set supported authentication session lifetime and revocation behavior consistent with the remote identity source and risk requirements. That separate change addresses: Firewall user sessions remain authorized long after an employee's access is revoked because authentication timeouts and revocation steps were not reviewed. It does not validate the current Northgate Telecom issue: Two trusted LAN subnets share a zone and a rule unintentionally grants them broad access to one another despite a segmentation requirement. The relevant acceptance evidence is: A test from an approved source reaches only its intended service while lateral traffic to restricted subnets is blocked.