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| Certification Vendor: | Fortinet |
|---|---|
| Exam Name: | FCSS - Network Security 7.6 Support Engineer |
| Exam Number: | FCSS_NST_SE-7.6 |
| Exam Duration: | 75 minutes |
| Passing Score: | Pass/Fail (No specific score published) |
| Available Languages: | English, Japanese |
| Real Exam Qty: | 40 |
| Related Certifications: | FCSS in Network Security |
| Exam Format: | Multiple-choice |
| Exam Price: | USD 200 |
| Certificate Validity Period: | 2 years |
| Sample Questions: | Fortinet FCSS_NST_SE-7.6 Sample Questions |
| Exam Way: | Pearson VUE (Online or Onsite) |
| Pre Condition: | Recommended NSE 4 and NSE 5 certifications. |
| Official Syllabus URL: | https://training.fortinet.com/local/staticpage/view.php?page=nse_certs |
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NEW QUESTION # 27
What can cause an IKEv2 tunnel to go down after it was initially brought up successfully?
Answer: D
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 # 28
Which statement about IKEv2 is true?
Answer: A
Explanation:
The correct answer is B.
The study guide explicitly states: "IKE version 2 does not interoperate with IKE version 1, but they share enough of the header format that both versions can unambiguously operate over the same UDP port." That directly proves B.
Why the other options are wrong:
A is wrong because the study guide shows authentication methods as Asymmetric for IKEv2 and Symmetric for IKEv1 C is wrong because the study guide does not say they use the same TCP port; instead, it specifically says they can operate over the same UDP port D is wrong because the study guide states: "IKEv2 does not use the concept of phase 1 or phase 2", even though FortiOS CLI/GUI still uses those terms for configuration purposes
NEW QUESTION # 29
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: B
NEW QUESTION # 30
In IKEv2, which exchange establishes the first CHILD_SA?
Answer: A
Explanation:
According to RFC 7296 (IKEv2) and Fortinet's official documentation, the IKE_SA_INIT exchange is responsible for negotiating cryptographic parameters, performing the initial Diffie-Hellman exchange, and implementing the cookie challenge mechanism for DoS protection. When the responder suspects a DoS attack (such as mass requests by the same source), it includes a cookie in the IKE_SA_INIT response. The initiator must return the cookie in its next request to prove that it truly exists at the IP address it claims, thereby mitigating resource exhaustion attacks.
This two-step exchange ensures the responder only allocates resources after successful proof of address, aligning with best security practices. Fortinet documentation confirms that this process occurs strictly in the IKE_SA_INIT phase, not in subsequent IKE_Auth or CHILD_SA exchanges.
References:
RFC 7296: IKEv2, Section 2.6, "Denial of Service Protection"
Fortinet FortiOS VPN Handbook: IKEv2 Exchange Process and DoS Protection Mechanism
NEW QUESTION # 31
Refer to the exhibit.
Partial output of the get vpn ipsec tunnel details command is shown. Based on the output, which two statements are correct? (Choose two.)
Answer: B,D
Explanation:
The correct answers are C and D .
The study guide's get vpn ipsec tunnel details example shows:
* replay: enabled
* inbound and outbound sections with separate SPIs
* NPU acceleration: encryption(outbound) decryption(inbound) and it labels these as "Phase 2 SAs for each direction" and "Hardware acceleration" This directly proves D. Anti-replay is enabled , because the output explicitly says replay: enabled For the NPU status, the study guide explains the exact npu_flag meanings:
* npu_flag=00 = both IPsec SAs loaded to the kernel
* npu_flag=01 = outbound IPsec SA copied to NPU
* npu_flag=02 = inbound IPsec SA copied to NPU
* npu_flag=03 = both outbound and inbound IPsec SAs copied to NPU
Because the exhibit shows hardware acceleration in both directions - encryption(outbound) and decryption(inbound) - the matching npu_flag is 03 , not 02. That makes C correct and A incorrect.
Why B is wrong:
The same study guide output labels the tunnel as having Phase 2 SAs for each direction , so different inbound and outbound SPIs are normal for the two SAs. Also, the FortiOS administration guide explains that auto-negotiate controls whether phase 2 SA negotiation is initiated automatically, not whether inbound and outbound SPIs are different: "By default the phase 2 security association (SA) is not negotiated until a peer attempts to send data... Auto-negotiate initiates the phase 2 SA negotiation automatically..." So the verified answers are: C, D .
NEW QUESTION # 32
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