View all questions & answers for the FCSS - Network Security 7.4 Support Engineer Exam Materials exam


Question 7 Discussion

What are two reasons you might see iprope_in_check() check failed, drop when using the debug flow? (Choose two answers)

  • A. VIP or IP pool misconfiguration
  • B. Trusted host list misconfiguration
  • C. Packet was dropped because of policy route misconfiguration
  • D. Packet was dropped because of traffic shaping
Correct Answer: A,B

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Kayone 2025-05-23 07:52:47

Selected Answers: A, C


trusted host list misconfiguration has nothing to do with packet drops but trusted hosts the correct answer is A and C

Kayone 2025-05-23 07:57:50

Selected Answers: A, C


Two Reasons for iprope_in_check() check failed, drop in Debug Flow (with FortiOS 7.4.7 References)
The iprope_in_check() check failed, drop error occurs when the FortiGate’s Reverse Path Forwarding (RPF) check fails. This means the packet arrived on an interface that doesn’t match the expected return path for the source IP (based on the routing table).

Correct Reasons (with FortiOS 7.4.7 Documentation References):
A. VIP or IP Pool Misconfiguration

If a Virtual IP (VIP) or IP pool is misconfigured, the FortiGate may not correctly associate the source IP with the expected ingress interface.

Example: A NAT rule forwards traffic to a VIP, but the return traffic arrives on a different interface, causing the RPF check to fail.

Reference:

FortiOS 7.4.7 Admin Guide – IP Pools

FortiOS 7.4.7 Admin Guide – Virtual IPs

C. Policy Route Misconfiguration

Policy-based routing (PBR) can override the default routing table, potentially causing packets to take an unexpected path.

If a policy route sends traffic out an interface that doesn’t match the reverse path in the routing table, the RPF check fails.

Reference:

FortiOS 7.4.7 Admin Guide – Policy Routing

Why Not the Other Options?
B. Trusted Host List Misconfiguration → Affects authentication (e.g., admin access), not RPF checks.

D. Traffic Shaping → Controls bandwidth, not packet path validation.

Final Answer (Based on FortiOS 7.4.7 Docs):
✅ A. VIP or IP pool misconfiguration
✅ C. Packet was dropped because of policy route misconfiguration

(Verified using the FortiOS 7.4.7 Administration Guide.)

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Brave-Dumps Admin 2025-05-23 13:54:15

Selected Answers: A, C


Dear Kayone, Thank you for sharing your experience in the Brave-Dumps community - you're doing great!

After carefully reviewing your comment, you were absolutely right. We’ve updated the correct answer on the website to reflect A and C.