Question 740
A FortiOS 7.6 team examines: A network test must show encryption remains active when WAN routing switches to a different ISP. Select TWO complementary choices: the most appropriate corrective action AND the specific evidence confirming success.
Explanation
Correct Answers
For the observed situation (A network test must show encryption remains active when WAN routing switches to a different ISP), the most specific acceptance evidence is: A primary path outage activates the approved alternate encrypted connection without unauthorized traffic bypass. It validates the recommended response: Design supported primary and alternate FortiGate IPsec tunnels and test route preference and peer availability under controlled failure. This addresses the documented risk: Two configured tunnels do not guarantee recovery if both depend on the same WAN circuit or backup routes are missing.
The reported FortiOS 7.6 condition is: A network test must show encryption remains active when WAN routing switches to a different ISP. The targeted administrative response is: Design supported primary and alternate FortiGate IPsec tunnels and test route preference and peer availability under controlled failure. The relevant failure risk is: Two configured tunnels do not guarantee recovery if both depend on the same WAN circuit or backup routes are missing. Validate with: A primary path outage activates the approved alternate encrypted connection without unauthorized traffic bypass.
Incorrect Answers
IPsec tunnel logging and diagnosis (5.1) addresses another technical failure: Treating all IPsec connectivity faults as cryptographic problems can cause unnecessary key or proposal changes. The case states: the most appropriate corrective action AND the specific evidence confirming success. The most direct paired action and test is: A primary path outage activates the approved alternate encrypted connection without unauthorized traffic bypass.
Route-based IPsec tunnel interface design (5.1) would demonstrate or implement: Route lookup, tunnel counters and narrow firewall policies confirm authorized packets cross the correct VPN interface. This choice can be useful for that problem, but it does not establish the Redundant site-to-site IPsec peers control being assessed here.
IPsec tunnel mtu and fragmentation (5.1) would demonstrate or implement: IPsec encapsulation overhead can make large packets fail even while small ICMP connectivity tests succeed. The required paired action and test concerns Redundant site-to-site IPsec peers; a passing result for this alternative could leave that requirement unresolved.