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| Certification Vendor: | Fortinet |
|---|---|
| Exam Name: | Fortinet FCSS - Network Security 7.6 Support Engineer |
| Exam Number: | FCSS_NST_SE-7.6 |
| Certificate Validity Period: | 2 years |
| Real Exam Qty: | 40 (range: 35–45) |
| Related Certifications: | FCSS - SD-WAN 7.6 Architect FCSS - Enterprise Firewall 7.6 Administrator FCSS - LAN Edge 7.6 Architect |
| Exam Price: | $200 USD (excluding taxes) |
| Available Languages: | English |
| Exam Duration: | 75 minutes |
| Passing Score: | Not publicly disclosed (Pass/Fail result) |
| Exam Format: | Multiple Choice, Multiple Select, Scenario-based questions |
| Recommended Training: | FortiOS 7.6 Administration and Troubleshooting Fortinet NSE 6 - Network Security Support Engineer Course |
| Exam Registration: | Pearson VUE Registration Fortinet Training Institute |
| Sample Questions: | Fortinet FCSS_NST_SE-7.6 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE test centers |
| Pre Condition: | No mandatory prerequisites; recommended: NSE 4 certification or equivalent knowledge, networking/security fundamentals, hands-on FortiGate experience |
| Official Syllabus URL: | https://training.fortinet.com/local/staticpage/view.php?page=fcss_network_security |
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NEW QUESTION # 85
Exhibit.
Refer to the exhibit, which contains partial output from an IKE real-time debug.
Which two statements about this debug output are correct? (Choose two.)
Answer: B,C
Explanation:
From the exhibit, you can observe that the debug output captures an IKEv1 negotiation in aggressive mode.
Let's break down the supporting details in line with official Fortinet IPsec VPN troubleshooting resources and debug guides:
For Option B:
The very first line of the debug output shows:
comes 10.0.0.2:500->10.0.0.1:500, ifindex=7.
This indicates the traffic direction-from the remote IP (10.0.0.2) with port 500 to the local IP (10.0.0.1) with port 500. According to Fortinet's documentation, the right side of the arrow always represents the local FortiGate gateway. Thus, 10.0.0.1 is the local gateway IP address.
For Option D:
You see the statement:
negotiation result "remote"
and
received peer identifier FQDNCE88525E7DE7F00D6C2D3C00000000
Official debug documentation describes that the "peer identifier" or peer ID sent by the initiator is displayed here. In the context of IKE/IPsec negotiation, this value is used as the IPsec peer ID for authentication and identification purposes. The initiator is providing "remote" as the peer ID for its connection.
Why Not A or C:
Perfect Forward Secrecy (PFS): The debug does not show any DH group negotiation in phase 2 (no reference to group2, group5, etc., for phase 2), so you cannot deduce the presence of PFS solely from this output.
Phase 2 negotiation: The log focuses on IKE (phase 1) negotiation and establishment; there's no reference to ESP protocol, Quick Mode, or other identifiers that would show phase 2 SA negotiation and establishment.
This interpretation aligns with the explanation in the FortiOS 7.6.4 Administration Guide's VPN section and the official debug command output samples published in Fortinet's documentation. It demonstrates how to distinguish between local and remote addresses and how to identify the use of peer IDs.
References:
FortiOS 7.6.4 Administration Guide: IPsec VPN and Debugging VPNs
Technical Support Resources on interpreting IKE debug output and peer ID roles
NEW QUESTION # 86
What can cause an IKEv2 tunnel to go down after it was initially brought up successfully?
Answer: B
Explanation:
The correct answer is D .
The study guide explains that IKEv2 has two initial exchanges:
* IKE_SA_INIT
* IKE_AUTH
and then later exchanges such as:
* CREATE_CHILD_SA
It also states the roles of those exchanges:
* IKE_SA_INIT negotiates the security settings for IKE traffic
* IKE_AUTH performs mutual authentication and sets up the piggyback child SA
* CREATE_CHILD_SA creates a new child SA or rekeys an existing child SA Most importantly, the study guide explicitly says:
"By IKEv2 design, no Diffie-Hellman public key is exchanged during an IKE_AUTH exchange.
Consequently, any phase 2 Diffie-Hellman group configuration mismatch between FortiGate and the peer is experienced only during the first rekey (CREATE_CHILD_SA exchange) of the child SA created during IKE_AUTH." This proves the key idea behind the question: an IKEv2 tunnel can come up successfully first, then fail later during a CREATE_CHILD_SA rekey/renegotiation event because of a phase 2 mismatch. Among the provided options, the matching later-stage cause is mismatched quick-mode selectors during CREATE_CHILD_SA .
Why the other options are wrong:
* A is wrong because if the proposal mismatch were in the initial negotiation path, the tunnel would fail during establishment, not after it was already up. The study guide places initial tunnel establishment in IKE_SA_INIT and IKE_AUTH
* B is wrong because a mismatch in IKE_SA_INIT affects the initial establishment stage, not a tunnel that was already brought up successfully
* C is wrong because a pre-shared key mismatch is part of authentication during IKE_AUTH , so the tunnel would not come up successfully in the first place
NEW QUESTION # 87
Exhibit.
Refer to the exhibit, which contains a screenshot of some phase 1 settings.
The VPN is not up. To diagnose the issue, the administrator enters the following CLI commands on an SSH session on FortiGate:
However, the IKE real-time debug does not show any output. Why?
Answer: D
Explanation:
To display debug output on FortiGate devices, you must always run both the application-specific debug command and the global debug enable command. The command diagnose debug application ike -1 sets up the detail level for the IKE daemon debug, but it does not display any debug output on its own. As described in the FortiOS CLI debugging manuals, the command diagnose debug enable activates debug output on the console, making all previously set debugs visible. This is especially important for VPN troubleshooting-without the enable command, no output appears even if there is VPN traffic.
The correct diagnostic sequence is:
diagnose debug application ike -1
diagnose debug enable
This procedure is found in every FortiOS CLI debug tutorial and troubleshooting workflow.
References:
FortiOS CLI Reference: Debugging VPNs and Real-time Debug Output
FortiGate VPN Troubleshooting Guide: Required Steps for Debug Output
NEW QUESTION # 88
Refer to the exhibits.
An administrator Is expecting to receive advertised route 8.8.8.8/32 from FGT-A. On FGT-B, they confirm that the route is being advertised and received, however, the route is not being injected into the routing table.
What is the most likely cause of this issue?
Answer: D
Explanation:
The 8.8.8.8/32 route is visible in the OSPF database on FGT-B but not installed into the routing table-the most likely explanation is that FGT-B is filtering it from being installed.
NEW QUESTION # 89
Refer to the exhibit, which shows one way communication of the downstream FortiGate with the upstream FortiGate within a Security Fabric.
What three actions must you take to ensure successful communication? (Choose three.)
Answer: B,C,D
NEW QUESTION # 90
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