Question 280
At Keystone BioLabs, the laboratory infrastructure team administers FortiGate-based protection for research sites with private data collection networks under requirements for sensitive workload isolation and measurable security events. Following the approved change, the team must validate: Internal users cannot reach a service by its public virtual IP because the relevant hairpin or same-interface DNAT path is not configured. Which observed outcome BEST demonstrates that the intended correction works?
Explanation
Correct Answer
An internal test client connects to the service's approved public hostname without leaking unintended internal services. This outcome validates the intended correction for: Internal users cannot reach a service by its public virtual IP because the relevant hairpin or same-interface DNAT path is not configured. The associated approved corrective action is: Design the supported internal-to-VIP access policy and necessary NAT and route behavior for the specific local topology. The Keystone BioLabs reviewer can therefore distinguish observable protection from an untested configuration claim.
Incorrect Answers
A known signed-in domain user matches the intended policy without an unnecessary FortiGate credential prompt. This would verify a separate corrective action: Use the supported Fortinet Single Sign-On identity mapping for the relevant Active Directory users and policy groups. That separate change addresses: A firewall rule requires explicit user login for domain-joined employees even though the approved design should use passive single sign-on. It does not validate the current Keystone BioLabs issue: Internal users cannot reach a service by its public virtual IP because the relevant hairpin or same-interface DNAT path is not configured. The relevant acceptance evidence is: An internal test client connects to the service's approved public hostname without leaking unintended internal services.
After a controlled logout the stale mapping is removed within the documented interval and a new session is no longer authorized. This would verify a separate corrective action: Review the collector's logoff detection, workstation verification or supported session expiration behavior and tune it for the deployment. That separate change addresses: FSSO mappings persist for a departed employee after workstation logout and the network access policy keeps honoring stale identity state. It does not validate the current Keystone BioLabs issue: Internal users cannot reach a service by its public virtual IP because the relevant hairpin or same-interface DNAT path is not configured. The relevant acceptance evidence is: An internal test client connects to the service's approved public hostname without leaking unintended internal services.
An authorized finance account reaches the application while an unrelated signed-in account on the same subnet is denied. This would verify a separate corrective action: Apply FortiGate identity-based policy matching with the required authenticated group in addition to source and destination objects. That separate change addresses: Two user groups share the same subnet but an address-only allow policy grants both access to a restricted finance application. It does not validate the current Keystone BioLabs issue: Internal users cannot reach a service by its public virtual IP because the relevant hairpin or same-interface DNAT path is not configured. The relevant acceptance evidence is: An internal test client connects to the service's approved public hostname without leaking unintended internal services.