Question 540
At Silvercrest University, the campus network defense team administers FortiGate-based protection for student and staff network services across buildings under requirements for separated identities and protected learning services. An independent validation is requested for: An application starts using encrypted DNS-over-HTTPS to evade approved DNS filtering and the firewall does not recognize its traffic type. Which observed outcome BEST demonstrates that the intended correction works?
Explanation
Correct Answer
An authorized ordinary DNS resolution succeeds and a controlled disallowed encrypted-DNS client is blocked or explicitly audited. This outcome validates the intended correction for: An application starts using encrypted DNS-over-HTTPS to evade approved DNS filtering and the firewall does not recognize its traffic type. The associated approved corrective action is: Evaluate supported application-control signatures or managed endpoint controls to restrict unauthorized encrypted DNS services. The Silvercrest University reviewer can therefore distinguish observable protection from an untested configuration claim.
Incorrect Answers
The verified legitimate package downloads and an unrelated antivirus test indicator is still detected by the active profile. This would verify a separate corrective action: Validate the false positive and apply a narrowly scoped supported exception with review and expiration while retaining other protections. That separate change addresses: Antivirus blocks a legitimate internal application package after a false-positive signature but the help desk disables the entire protection profile. It does not validate the current Silvercrest University issue: An application starts using encrypted DNS-over-HTTPS to evade approved DNS filtering and the firewall does not recognize its traffic type. The relevant acceptance evidence is: An authorized ordinary DNS resolution succeeds and a controlled disallowed encrypted-DNS client is blocked or explicitly audited.
An authorized harmless antivirus test attachment triggers the expected action while normal message delivery remains functional. This would verify a separate corrective action: Configure appropriate supported antivirus scanning for the permitted mail protocol and matching policy or inspection profile. That separate change addresses: A mail relay transfers an infected test attachment through a service not covered by the current FortiGate antivirus protocol options. It does not validate the current Silvercrest University issue: An application starts using encrypted DNS-over-HTTPS to evade approved DNS filtering and the firewall does not recognize its traffic type. The relevant acceptance evidence is: An authorized ordinary DNS resolution succeeds and a controlled disallowed encrypted-DNS client is blocked or explicitly audited.
A safe test submission reaches the intended sandbox service and its verdict can be correlated with the firewall antivirus event. This would verify a separate corrective action: Configure the supported FortiSandbox or appropriate cloud sandbox integration and required submission path for eligible files. That separate change addresses: A FortiGate malware investigation expects remote sandbox verdicts but the approved sandbox connection is not configured or reachable. It does not validate the current Silvercrest University issue: An application starts using encrypted DNS-over-HTTPS to evade approved DNS filtering and the firewall does not recognize its traffic type. The relevant acceptance evidence is: An authorized ordinary DNS resolution succeeds and a controlled disallowed encrypted-DNS client is blocked or explicitly audited.