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Fortinet FCSS_NST_SE-7.6 Exam Syllabus Topics:

Topic	Details
Topic 1	System troubleshooting: This section of the exam measures the skills of Network Security Support Engineers and addresses diagnosing and correcting issues within Security Fabric setups, automation stitches, resource utilization, general connectivity, and different operation modes in FortiGate HA clusters. Candidates work with built-in tools to effectively find and resolve faults.
Topic 2	Authentication: This section evaluates the abilities of System Administrators and requires troubleshooting both local and remote authentication methods, including resolving Fortinet Single Sign-On (FSSO) problems for secure network access.
Topic 3	Routing: This section focuses on Network Engineers and involves tackling issues related to packet routing using static routes, as well as OSPF and BGP protocols to support enterprise network traffic flow.
Topic 4	Security profiles: This part measures skills of Security Operations Specialists and covers identifying and resolving problems linked to FortiGuard services, web filtering configurations, and intrusion prevention systems to maintain protection across network environments.
Topic 5	VPN: This section is aimed at IT Professionals and includes diagnosing and addressing issues with IPsec VPNs, specifically IKE version 1 and 2, to secure remote and site-to-site connections within the network infrastructure.

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Fortinet FCSS - Network Security 7.6 Support Engineer Sample Questions (Q102-Q107):

NEW QUESTION # 102
Refer to the exhibit.

An IPsec VPN tunnel using IKEv2 was brought up successfully, but when the tunnel rekey takes place the tunnel goes down.
The debug command for IKE was enabled and, in the exhibit, you can review the partial output of the debug IKE while attempting to bring the tunnel up.
What is causing. The tunnel to be down?

A. A mismatch m the Phase 1 negotiations
B. A mismatch in the Phase 2 negotiations
C. A Diffie-Hellman mismatch
D. Blocked traffic on UDP port 500

Answer: C

Explanation:
To determine the cause of the failure, we must analyze the IKEv2 debug output provided in the exhibit (image_ad3dc6.jpg):
Identify the Negotiation Phase:
The debug log shows: responder received CREATE_CHILD exchange.
In IKEv2, the CREATE_CHILD_SA exchange is used to create new Child SAs (Phase 2) or to rekey existing ones.
The fact that the tunnel was previously "brought up successfully" implies the initial IKE SA (Phase 1) is stable, and this error is occurring specifically during a rekey event, which often involves Perfect Forward Secrecy (PFS).
Analyze the Proposals (The Mismatch):
Incoming Proposal (Remote Peer):
The remote peer sends a proposal containing two Diffie-Hellman groups: type=DH_GROUP, val=MODP2048 (Group 14) and type=DH_GROUP, val=MODP1536 (Group 5).
My Proposal (Local FortiGate):
The local FortiGate configuration expects: type=DH_GROUP, val=MODP3072 (Group 15).
Result of the Negotiation:
The debug output concludes with: no proposal chosen and Negotiate SA Error.
This error occurs because the local FortiGate cannot find a common Diffie-Hellman group between what it requires (Group 15) and what the peer is offering (Groups 14 or 5).
While this is technically a mismatch occurring during the Phase 2 (Child SA) creation, "A Diffie-Hellman mismatch" (Option A) is the precise root cause identified in the logs.
Why other options are incorrect:
B: The log shows received create-child request, confirming that UDP traffic is reaching the device and is not blocked.
C: The failure is in the CREATE_CHILD exchange (Phase 2/Rekey), not the IKE_SA_INIT or IKE_AUTH (Phase 1) exchanges.
D: While the mismatch is occurring within the Phase 2 definitions, Option A is the specific technical reason for the no proposal chosen error shown in the DH_GROUP lines.
Reference:
FortiGate Security 7.6 Study Guide (IPsec VPN): "Phase 2 parameters... if Perfect Forward Secrecy (PFS) is enabled, a Diffie-Hellman exchange is performed again. Both peers must match the DH Group."

NEW QUESTION # 103
Refer to the exhibit showing a debug output.

An administrator deployed FSSO in DC Agent Mode but FSSO is failing on FortiGate. Pinging FortiGate from where the collector agent is deployed is successful.
The administrator then produces the debug output shown in the exhibit.
What could be causing this error message?

A. The FortiGate cannot resolve the active directory server name.
B. The collector agent preshared password is mismatched.
C. The FortiGate and the collector agent are using different TCP ports.
D. The TCP port 445 is blocked between FortiGate and collector agent.

Answer: C

NEW QUESTION # 104
Refer to the exhibit, which shows the output o! the BGP database.

Which two statements are correct? (Choose two.)

A. The output shows all prefixes advertised by all neighbors as well as the local router.
B. The advertised prefix of 10.20.30.0/24 is being advertised through the redistribution of another routing protocol.
C. The advertised prefix of 10.20.30.0/24 was configured using the network command.
D. The first four prefixes are being advertised using a legacy route advertisement.

Answer: A,C

Explanation:
For Option A:In Fortinet BGP (and standard BGP), when a prefix is displayed with an "i" (lowercase i) in the Path column, it represents an internal prefix that originated from the local router, typically configured via the BGP "network" command. In the exhibit, the prefix 10.20.30.0/24 is listed with a Path value of i, indicating it was injected into BGP by the local router using the network statement, not via redistribution from another routing protocol. The same logic applies to i as documented: "Origin code 'i' means the route was injected via the network command." For Option D:The get router info bgp network output is a summary table displaying both local and received BGP routes. It lists all known routes to the BGP process, whether received from peers or originated locally. The exhibit shows all BGP prefixes known to the local router, matching the official admin guide's description of this command's output.
Explanation for B and C:
The phrase "legacy route advertisement" is not formalized in BGP documentation or Fortinet's admin guide; the output uses standard BGP mechanics.
If a route was redistributed into BGP from another routing protocol, the Path field would display a "?" (question mark) for incomplete (redistributed) origin. Here the /24 route has "i" so it is NOT a redistribution.
References:
FortiOS Administration Guide: BGP Configuration and Route Table Interpretation Official BGP Command Reference: Show BGP Network, Path Codes, Route Origination Indicators

NEW QUESTION # 105
Refer to the exhibit.

If the default settings are m place, what can you conclude about the conserve mode shown in the exhibit?

A. FortiGate is currently allowing now sessions that require flow-based or proxy-based content inspection, but is not performing inspection on those sessions.
B. FortiGate is currently blocking all new sessions regardless of the content inspection requirements or configuration settings because of high memory use.
C. FortiGate is currently allowing new sessions and will continue to allow sessions if memory increases another 6%.
D. FortiGate is currently allowing new sessions that require flow-based content inspection and blocking sessions that require proxy-based content inspection

Answer: A

Explanation:
The exhibit shows:
memory conserve mode: on
memory used: 2706 MB 89% of total RAM
memory used threshold red: 2675 MB 88% of total RAM
memory used + freeable threshold extreme: 2887 MB 95% of total RAM
The study guide states that the default thresholds are:
Extreme = 95%
Red = 88%
Green = 82%
So this FortiGate is in conserve mode because memory usage is 89%, which is above the red threshold (88%), but it has not yet reached the extreme threshold (95%).
The study guide then explains exactly what happens during conserve mode:
"For traffic that requires proxy-based inspection (and if memory usage has not exceeded the extreme threshold):
config system global
set av-failopen [off | pass | one-shot]
...
pass (default): All new sessions pass without inspection"
It also says:
"The av-failopen setting also applies to flow-based antivirus inspection." And the same page adds:
"If memory usage exceeds the extreme threshold, all new sessions that require inspection (flow-based or proxy-based) are blocked." Therefore, with default settings and with memory usage below the extreme threshold, FortiGate is allowing new sessions that require inspection, but bypassing inspection. That matches C.
Why the other options are wrong:
A is wrong because the default behavior is not to block proxy-based inspected sessions; the default is pass, meaning they pass without inspection B is wrong because if memory rises another 6%, it reaches 95%, which is the extreme threshold. At that point, the study guide says all new sessions that require inspection are blocked D is wrong because FortiGate blocks all new inspected sessions only when memory usage exceeds the extreme threshold, and the exhibit shows it is currently at 89%, not 95%

NEW QUESTION # 106
Refer to the exhibit, which shows the output of diagnose sys session list.

If the HA ID for the primary device is 0, what happens if the primary fails and the secondary becomes the primary?

A. The session will be removed from the session table of the secondary device because of the presence of allowed error packets, which will force the client to restart the session with the server.
B. The session state is preserved but the kernel will need to re-evaluate the session because NAT was applied.
C. The secondary device has this session synchronized; however, because application control is applied, the session is marked dirty and has to be re-evaluated after failover.
D. Traffic for this session continues to be permitted on the new primary device after failover, without requiring the client to restart the session with the server.

Answer: D

NEW QUESTION # 107
......

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