Question 310
At Lakeside Research, the cybersecurity services team administers FortiGate-based protection for campus labs and private research infrastructure under requirements for identity-aware segmentation and evidence retention. Following the approved change, the team must validate: IPv6 clients fail after an IPv4 NAT change because the administrator assumes ordinary IPv4 source NAT is required for every IPv6 route. Which observed outcome BEST demonstrates that the intended correction works?
Explanation
Correct Answer
An approved IPv6 test reaches its destination with the expected IPv6 source and does not depend on an unrelated IPv4 NAT pool. This outcome validates the intended correction for: IPv6 clients fail after an IPv4 NAT change because the administrator assumes ordinary IPv4 source NAT is required for every IPv6 route. The associated approved corrective action is: Design the proper supported IPv6 routing and policy path and use IPv6 translation only when specifically required by the approved architecture. The Lakeside Research reviewer can therefore distinguish observable protection from an untested configuration claim.
Incorrect Answers
The RADIUS server records an accepted approved user attempt and the FortiGate assigns the correct authenticated user identity. This would verify a separate corrective action: Correct FortiGate RADIUS source selection, shared secret and trusted server reachability for the intended authentication flow. That separate change addresses: A network uses RADIUS for contractor logins but packets leave the wrong FortiGate source interface and the authentication server discards them. It does not validate the current Lakeside Research issue: IPv6 clients fail after an IPv4 NAT change because the administrator assumes ordinary IPv4 source NAT is required for every IPv6 route. The relevant acceptance evidence is: An approved IPv6 test reaches its destination with the expected IPv6 source and does not depend on an unrelated IPv4 NAT pool.
An unauthenticated client is redirected or denied according to policy and an authorized signed-in user receives only its approved access. This would verify a separate corrective action: Configure the appropriate identity-based authentication rule and captive portal method for the designated user segment. That separate change addresses: An office requires browser-based authentication for unknown users, but the FortiGate policy allows traffic without enforcing its captive portal. It does not validate the current Lakeside Research issue: IPv6 clients fail after an IPv4 NAT change because the administrator assumes ordinary IPv4 source NAT is required for every IPv6 route. The relevant acceptance evidence is: An approved IPv6 test reaches its destination with the expected IPv6 source and does not depend on an unrelated IPv4 NAT pool.
A test login proves the intended role and a separate traffic session matches only the appropriate authenticated user policy. This would verify a separate corrective action: Configure the supported authentication integration in the correct administrative or firewall user context and scope the access rule separately. That separate change addresses: A security administrator confuses SAML identity provider trust for administrative login with the firewall policy identity enforcement required for user traffic. It does not validate the current Lakeside Research issue: IPv6 clients fail after an IPv4 NAT change because the administrator assumes ordinary IPv4 source NAT is required for every IPv6 route. The relevant acceptance evidence is: An approved IPv6 test reaches its destination with the expected IPv6 source and does not depend on an unrelated IPv4 NAT pool.