Question 760
A FortiOS 7.6 team examines: A support team needs to distinguish a negotiation failure from a permitted encrypted flow denied after decryption. Select TWO complementary choices: the most appropriate corrective action AND the specific evidence confirming success.
Explanation
Correct Answers
The reported FortiOS 7.6 condition is: A support team needs to distinguish a negotiation failure from a permitted encrypted flow denied after decryption. The targeted administrative response is: Use FortiGate VPN event logs and approved bounded diagnostic data to distinguish IKE, phase-two, routing and firewall policy failures. The relevant failure risk is: Treating all IPsec connectivity faults as cryptographic problems can cause unnecessary key or proposal changes. Validate with: A test incident is isolated to the correct VPN lifecycle stage and the exact corrected phase is verified.
For the observed situation (A support team needs to distinguish a negotiation failure from a permitted encrypted flow denied after decryption), the most specific acceptance evidence is: A test incident is isolated to the correct VPN lifecycle stage and the exact corrected phase is verified. It validates the recommended response: Use FortiGate VPN event logs and approved bounded diagnostic data to distinguish IKE, phase-two, routing and firewall policy failures. This addresses the documented risk: Treating all IPsec connectivity faults as cryptographic problems can cause unnecessary key or proposal changes.
Incorrect Answers
Redundant site-to-site IPsec peers (5.1) would demonstrate or implement: A primary path outage activates the approved alternate encrypted connection without unauthorized traffic bypass. The case states: A support team needs to distinguish a negotiation failure from a permitted encrypted flow denied after decryption. The most direct paired action and test is: Use FortiGate VPN event logs and approved bounded diagnostic data to distinguish IKE, phase-two, routing and firewall policy failures.
IPsec anti-replay and time-drift troubleshooting (5.1) addresses another technical failure: Large traffic reordering or stale security association state can cause legitimate encrypted packets to be discarded. This choice can be useful for that problem, but it does not establish the IPsec tunnel logging and diagnosis control being assessed here.
IPsec phase-one ike identity and proposals (5.1) would demonstrate or implement: Peer identity or proposal mismatch can prevent tunnel negotiation even when the internet path and gateway IP are reachable. The paired-answer requirement concerns IPsec tunnel logging and diagnosis; this alternative does not provide the matching intervention and separate acceptance evidence.