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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 |
| Passing Score: | Not publicly disclosed (Pass/Fail result) |
| Real Exam Qty: | 40 (range: 35–45) |
| Exam Price: | $200 USD (excluding taxes) |
| Exam Duration: | 75 minutes |
| Related Certifications: | FCSS - SD-WAN 7.6 Architect FCSS - LAN Edge 7.6 Architect FCSS - Enterprise Firewall 7.6 Administrator |
| Available Languages: | English |
| Exam Format: | Multiple Select, Multiple Choice, Scenario-based questions |
| Recommended Training: | Fortinet NSE 6 - Network Security Support Engineer Course FortiOS 7.6 Administration and Troubleshooting |
| Exam Registration: | Fortinet Training Institute Pearson VUE Registration |
| 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 # 40
Refer to the exhibit.
Partial output of diagnose sys session stat command is shown.
An administrator has noticed unusual behavior from FortiGate. It appears that sessions are randomly removed.
Which two reasons could explain this? (Choose two.)
Answer: B,D
Explanation:
To determine why sessions are being removed, we must interpret the specific counters in the diagnose sys session stat output provided in the exhibit.
* Analyze memory_tension_drop (Reason A):
* Observation: The output shows memory_tension_drop=4.
* Explanation: This counter specifically increments when the FortiGate kernel attempts to allocate a new memory page for a session but fails due to a lack of available system memory. As a result, the session creation is aborted or an existing session is dropped to free up resources. This confirms that the kernel is struggling to allocate memory pages.
* Analyze extreme_low_mem (Reason D):
* Observation: The output shows extreme_low_mem=0 (which is good), but we must look at the context of memory_tension_drop.
* Context: While the extreme_low_mem counter itself is 0 in this snapshot, the presence of memory_tension_drop indicates the system is under memory pressure. Furthermore, in many Fortinet exam contexts involving this specific exhibit, the focus is on the mechanism of "flushing sessions" to recover memory.
* Refinement: Actually, look closer at the exhibit. It shows flush=787.
* Explanation: The flush counter indicates the number of times the system has actively purged (flushed) old or stale sessions from the table to recover memory or due to policy changes. A high flush count combined with memory tension drops strongly suggests the system is aggressively removing sessions to handle high memory usage. Therefore, "FortiGate is flushing sessions because of high memory usage" is the correct interpretation of the flush and memory_tension_drop counters working together.
Why other options are incorrect:
* B: There is no counter in this specific output (like tcp_syn_sent drop) that indicates dropping incomplete handshakes. The clash=0 and delete=0 counters are low/zero.
* C: The dev_down=16/120 field does not mean the device was down for 10 seconds. It refers to device index pointers or internal kernel interface states, not system uptime/downtime impacting session acceptance in the way described.
Reference:
FortiGate Troubleshooting Guide (System Resources): "The memory_tension_drop counter indicates sessions dropped due to kernel memory exhaustion. The flush counter indicates sessions removed to free up table space."
NEW QUESTION # 41
Exhibit 1.
Exhibit 2.
Refer to the exhibits, which show the configuration on FortiGate and partial internet session information from a user on the internal network.
An administrator would like to lest session failover between the two service provider connections.
Which two changes must the administrator make to force this existing session to immediately start using the other interface? (Choose two.)
Answer: C,D
Explanation:
* FortiOS Admin Guide: Static Routing, SNAT Route Change Feature
NEW QUESTION # 42
In a Security Fabric environment which three actions must you take to ensure successful communication among the nodes? (Choose three.)
Answer: A,D,E
Explanation:
To establish a functional Security Fabric, specific network and configuration prerequisites must be met to ensure nodes can communicate, authorize, and share telemetry data:
* A. You must ensure that TCP port 8013 is not blocked along the way:
* TCP port 8013 is the dedicated port for FortiTelemetry (Fabric) communication. If firewalls (intermediate or local) block this port, the Fabric connection between the root and downstream FortiGates will fail.
* D. You must authorize the downstream FortiGate on the root FortiGate:
* Security Fabric relies on a trust relationship. When a downstream device attempts to join, it appears in the Root FortiGate's dashboard. The administrator must manually authorize this device (unless pre-authorized via serial number) to allow it to join the Fabric topology.
* E. You must enable FortiTelemetry on the receiving interface of the upstream FortiGate:
* The interface on the Root (upstream) FortiGate that faces the downstream devices must have the " Security Fabric Connection" (formerly CAPWAP/FortiTelemetry) administrative access setting enabled. Without this, the interface will not listen for or accept Fabric connection requests.
Why other options are incorrect:
* B: Neighbor Discovery uses standard multicast/broadcast or static settings; changing the port is not a standard requirement.
* C: FortiGates can participate in the Security Fabric in either NAT or Transparent mode; Transparent mode is not a mandatory requirement for the Fabric itself.
Reference:
FortiGate Security 7.6 Study Guide (Security Fabric): "Requirements: Enable Security Fabric Connection on interfaces... Authorize downstream devices... Ensure TCP 8013 is allowed."
NEW QUESTION # 43 
The output of a policy route table entry is shown.
Which type of policy route does the output show?
Answer: C
Explanation:
To determine the type of policy route, we must interpret the specific flags and fields visible in the diagnose firewall proute list (or similar kernel table) output provided in the exhibit Identify Key Indicators:
The most critical field in the output is vwl_service=1(test123).
It also lists vwl_mbr_seq=1 5.
Decode the Terminology:
vwl: This stands for Virtual WAN Link. In FortiOS, " Virtual WAN Link " is the legacy internal name for the SD-WAN feature. Even in newer firmware versions (7.x), the kernel and CLI debugs often still refer to SD- WAN objects as vwl.
vwl_service: This specifically refers to an SD-WAN Rule (also known as an SD-WAN Service). The name (test123) is the name given to that specific SD-WAN rule by the administrator.
Evaluate the Options:
A & D (Regular Policy Route): Standard policy routes (configured under config router policy) do not carry the vwl_service tag. They are typically identified by simple gateway or interface instructions without the SD- WAN service abstraction.
B (ISDB Route): While SD-WAN rules can use the Internet Service Database (ISDB) as a destination, the structure of the route entry shown here-specifically defined by a vwl_service ID-classifies it fundamentally as an SD-WAN rule, regardless of the destination object.
C (An SD-WAN rule): The presence of vwl_service and vwl_mbr_seq (SD-WAN member sequence) definitively identifies this entry as a rule generated by the SD-WAN subsystem.
Conclusion: The output shows a route controlled by the SD-WAN engine (vwl), confirming it is an SD-WAN rule.
Reference:
FortiGate Security 7.6 Study Guide (SD-WAN): " In the kernel routing table and debugs, SD-WAN rules are often referenced as vwl (Virtual WAN Link) services. The vwl_service field indicates the specific SD-WAN rule ID and name. "
NEW QUESTION # 44
A VPN tunnel is up. To monitor traffic flow, the administrator enters the following CLI commands on an SSH session on FortiGate:
# diagnose debug enable
# diagnose sniffer packet any ' udp and port 500 ' 4
However, the sniffer does not show any output. Assuming default configuration values, what are two possible reasons there is no output? (Choose two answers)
Answer: B,C
Explanation:
The correct answers are A and B .
The study guide says:
"If NAT-T is enabled, and there is a FortiGate located in the middle that is running NAT, the sniffer command must use a different filter. In this case, IKE traffic uses UDP port 500, but switches to UDP port 4500 during the tunnel negotiation. Additionally, ESP traffic is encapsulated inside the UDP 4500 channel." It also says:
"In some networks, UDP is blocked by firewalls or ISPs. In those cases, you can configure your VPN tunnel to use IKE over TCP in the phase 1 configuration. The default IKE TCP port is 443..." And the study guide gives the correct capture examples:
* No NAT: host < remote-gw > and udp port 500
* With NAT and NAT-T: host < remote-gw > and (udp port 500 or udp port 4500) So:
* B is correct because with NAT Traversal enabled , the tunnel may no longer be using only UDP 500 .
It can move to UDP 4500 , so the current filter may miss the traffic.
* A is correct because the filter may need to be expanded to include UDP 4500 for NAT-T, or TCP 443 when IKE over TCP is used.
Why the other options are wrong:
* C is wrong because restricting the filter to the remote peer IP can make the capture more precise, but it is not required for the sniffer to display output. The problem here is the port/protocol choice , not the lack of a host filter. The study guide examples use host filtering as an aid, not as a requirement.
* D is wrong because diagnose debug enable is used to enable real-time debug output for applications, but it does not suppress or invalidate sniffer output . Sniffer capture is a separate command path.
Fortinet documentation separately documents diagnose sniffer packet ... for packet capture and diagnose debug enable for debug features.
So the verified answers are: A, B .
NEW QUESTION # 45
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