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NSE4 · Question #288

NSE4 Question #288: Real Exam Question with Answer & Explanation

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Submitted by dimitri_ru· Apr 18, 2026VPN and Routing

Question

A FortiClient fails to establish a VPN tunnel with a FortiGate unit. The following information is displayed in the FortiGate unit logs: msg="Initiator: sent 192.168.11.101 main mode message #1 (OK)" msg="Initiator: sent 192.168.11.101 main mode message #2 (OK)" msg="Initiator: sent 192.168.11.101 main mode message #3 (OK)" msg="Initiator: parsed 192.168.11.101 main mode message #3 (DONE)" msg="Initiator: sent 192.168.11.101 quick mode message #1 (OK)" msg="Initiator: tunnel 192.168.1.1/192.168.11.101 install ipsec sa" msg="Initiator: sent 192.168.11.101 quick mode message #2 (DONE)" msg="Initiator: tunnel 192.168.11.101, transform=ESP_3DES, HMAC_MD5" msg="Failed to acquire an IP address Which of the following statements is a possible cause for the failure to establish the VPN tunnel?

Options

  • AAn IPSec DHCP server is not enabled on the external interface of the FortiGate unit.
  • BThere is no IPSec firewall policy configured for the policy-based VPN.
  • CThere is a mismatch between the FortiGate unit and the FortiClient IP addresses in the phase 2
  • DThe phase 1 configuration on the FortiGate unit uses Aggressive mode while FortiClient uses

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Topics

#VPN Troubleshooting#IPsec VPN#Remote Access VPN#DHCP for VPN
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