Question 280
An administrator creates only a branch-to-head-office policy and assumes reply traffic will work without considering the reverse direction and matching inbound policy context. Which FortiOS 7.6 configuration or corrective action is MOST appropriate?
Explanation
Correct Answer
Build supported route-based FortiGate IPsec tunnel interfaces with destination routes and bidirectional firewall policies so accepted encrypted traffic travels through the correct tunnel. This directly addresses the FortiOS configuration or response required by the case. An established VPN SA cannot route user packets without valid route and firewall policy; applying source NAT across a private site-to-site tunnel can break peer selectors or application identity. Verify with: Inspect tunnel interface status, active static or dynamic routes, firewall source and destination interfaces, NAT settings, selectors and session diagnostics. Scenario: An administrator creates only a branch-to-head-office policy and assumes reply traffic will work without considering the reverse direction and matching inbound policy context.
Incorrect Answers
Integrate FortiGate IPsec tunnel interfaces into a supported SD-WAN steering design, ensuring underlay reachability, overlay routes and matching firewall policies for protected traffic. This addresses SD-WAN IPsec overlay routing and tunnel path choice, but not the principal task of the described flow. An SD-WAN member rule may select a physical underlay without providing the encrypted overlay route; policy, tunnel health and overlay steering are distinct dependencies. The better fit is: Build supported route-based FortiGate IPsec tunnel interfaces with destination routes and bidirectional firewall policies so accepted encrypted traffic travels through the correct tunnel. Scenario: An administrator creates only a branch-to-head-office policy and assumes reply traffic will work without considering the reverse direction and matching inbound policy context.
Build a FortiGate intrusion prevention sensor using supported signature filters, action overrides and protected-application context, then attach it to the correct policy. This addresses IPS signature filters, severity and policy actions, but not the principal task of the described flow. Signature severity alone does not guarantee relevance; a disabled or monitor-only IPS rule may log threats without blocking, and encrypted payloads need appropriate inspection. The better fit is: Build supported route-based FortiGate IPsec tunnel interfaces with destination routes and bidirectional firewall policies so accepted encrypted traffic travels through the correct tunnel. Scenario: An administrator creates only a branch-to-head-office policy and assumes reply traffic will work without considering the reverse direction and matching inbound policy context.
Correlate TLS metadata visibility, SNI or certificate names and FortiOS web-filter logs to determine when domain-only versus full-URL controls are technically enforceable. This addresses HTTPS web filtering hostname limitations and logging, but not the principal task of the described flow. Certificate inspection does not expose all encrypted HTTP headers and paths; some modern encrypted client protocols reduce metadata availability. The better fit is: Build supported route-based FortiGate IPsec tunnel interfaces with destination routes and bidirectional firewall policies so accepted encrypted traffic travels through the correct tunnel. Scenario: An administrator creates only a branch-to-head-office policy and assumes reply traffic will work without considering the reverse direction and matching inbound policy context.