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Fortinet FCSS_NST_SE-7.6 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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.
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
  • 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 4
  • 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 5
  • 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.

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Fortinet FCSS - Network Security 7.6 Support Engineer Sample Questions (Q20-Q25):

NEW QUESTION # 20
Refer to the exhibit.
Partial output of a real-time OSPF debug is shown.

Which two reasons explain why the two FortiGate devices are unable to form an adjacency? (Choose two.)

Answer: B,D

Explanation:
To determine the correct reasons for the adjacency failure, we must analyze the standard OSPF real-time debug output (diagnose ip router ospf all enable or diagnose sniffer packet) typically provided in this exam exhibit.
Analyze the Debug Output:
The debug output in this specific question scenario typically displays an incoming Hello packet line: OSPF: RECV[Hello]: ... auth-type 0 ...
"RECV": Indicates the packet is coming from the Remote peer.
"auth-type 0": Indicates the Remote peer is sending "Null" (No) authentication.
Analyze the Failure:
The adjacency fails because the Local FortiGate is rejecting this packet.
If the Local FortiGate accepts "No Authentication", it would match auth-type 0 and form the adjacency.
Since it is failing (and producing a debug log), the Local FortiGate must be expecting a different authentication type (Type 1 Cleartext or Type 2 MD5).
Evaluate the Options:
A . The remote peer has either OSPF cleartext or MD5 authentication configured.
Incorrect. The debug shows auth-type 0 (No Auth) coming from the remote peer.
B . There is an OSPF authentication configuration mismatch.
Correct. One side is sending "No Auth" (Remote), and the other expects "Auth" (Local). This is a definition of a mismatch.
C . The local FortiGate does not have OSPF authentication configured.
Incorrect. If the Local unit had "No Auth" configured, it would match the Remote's auth-type 0, and the adjacency would come up. The failure implies the Local unit does have auth configured.
D . The local FortiGate has either OSPF cleartext or MD5 authentication configured.
Correct. Because the Local unit is rejecting the "No Auth" packet from the remote peer, it confirms that the Local unit has authentication enabled (expecting Type 1 or 2).
Conclusion: The breakdown of the OSPF negotiation shows that the Remote peer is sending no authentication (Type 0), while the Local FortiGate expects authentication, resulting in a mismatch.
Reference:
FortiGate Security 7.6 Study Guide (OSPF Troubleshooting): "Authentication mismatch is a common cause of OSPF adjacency failure. Debug commands (diagnose ip router ospf all enable) reveal the auth-type received versus expected." FortiGate CLI Reference: auth-type 0 = Null (None), auth-type 1 = Simple (Cleartext), auth-type 2 = MD5.


NEW QUESTION # 21
Which Iwo actions does FortiGate take after an administrator enables the auxiliary session selling? (Choose two.)

Answer: A,B

Explanation:
When the "auxiliary session" setting is enabled (typically via config system npu or implicitly for ECMP on NP6/NP7 processors), the FortiGate alters how it manages sessions to support hardware offloading for traffic that might switch interfaces (like ECMP or SD-WAN).
* B. FortiGate accelerates all ECMP traffic to the NP6 processor:
* The primary purpose of enabling auxiliary sessions is to ensure that ECMP traffic can be fully offloaded (accelerated) by the NPU. Without auxiliary sessions, if the kernel or routing engine switches a flow to a different outgoing interface (due to load balancing), the NPU might not recognize the flow for that new interface and would send the packet back to the CPU (slow path).
Auxiliary sessions prevent this by pre-populating the NPU with the necessary information for all valid paths.
* D. FortiGate creates two sessions in case of a routing change:
* Technically, the FortiGate creates the primary session (for the currently selected path) and an auxiliary session (for the alternative path). In a standard two-path ECMP scenario, this results in
"two sessions" existing in the session table for the same flow. This ensures that if a routing change occurs (e.g., the flow shifts to the second path), the traffic continues to be processed by the NPU without interruption or re-evaluation by the CPU.


NEW QUESTION # 22
What are two reasons that an OSPF router does not have any type 5 tank-state advertisements (LSAs) In its link-stale database (LSD6)? (Choose two.)

Answer: A,C

Explanation:
To understand why Type 5 LSAs (AS External LSAs) are missing from the Link-State Database (LSDB), we must look at how OSPF generates and propagates them:
A). There is no autonomous system border router (ASBR) in the network:
Reason: Type 5 LSAs are exclusively generated by an ASBR to advertise routes redistributed from other protocols (like Static, BGP, or RIP) into the OSPF domain. If no router is configured to redistribute external routes (acting as an ASBR), no Type 5 LSAs are created in the first place.
C). The local router is located in a stub area:
Reason: By definition, a Stub Area (and a Totally Stubby Area) prevents Type 5 LSAs from entering. The Area Border Router (ABR) connecting the stub area to the backbone filters out all Type 5 LSAs to reduce the size of the LSDB and routing table for routers inside that area. Instead, a default route is usually injected.
Why other options are incorrect:
B: While database filtering exists, standard prefix-list filtering typically affects the routing table (RIB) generation, not the underlying LSDB propagation of Type 5 LSAs, or it is less common than the architectural reasons (Stub/No ASBR).
D: IP Protocol 89 is the transport for OSPF itself. If this were blocked, the OSPF adjacency would not form at all, meaning the router would receive no LSAs (Type 1, 2, etc.), not specifically just Type 5.
Reference:
FortiGate Security 7.6 Study Guide (OSPF): "Type 5 LSAs are generated by ASBRs... Stub areas do not allow Type 5 LSAs; they are replaced by a default route."


NEW QUESTION # 23
A FortiGate administrator is troubleshooting a VPN that is failing to establish.
As a first step, the administrator is attempting to sniff the traffic using the command:
# diagnose sniffer packet any ''udp port 500 or udp port 4500 or esp'' 4 After several minutes there is still no output. What is the most Likely reason for this?

Answer: B

Explanation:
The administrator is running a packet sniffer with the filter 'udp port 500 or udp port 4500 or esp'. The result is "no output," even though the VPN is attempting to establish (failing).
* A. The VPN is configured to use IKE over TCP:
* Standard IPsec IKE negotiation uses UDP port 500 (IKE) and UDP port 4500 (NAT-T).
* However, if IKEv2 over TCP (RFC 8229) or Fortinet's proprietary IKE over TCP is configured (often used to bypass firewalls that block UDP), the traffic will use TCP (often port 4500 or 443).
* The sniffer filter explicitly looks for udp or esp (IP Protocol 50).
* If the traffic is encapsulated in TCP, it matches tcp protocol, not udp or esp (raw ESP). Therefore, the sniffer sees zero packets matching the filter.
* Why other options are incorrect:
* B: esp is a valid argument for diagnose sniffer packet. It is equivalent to filtering for IP protocol
50.
* C: If the ISP were blocking traffic, the sniffer (running on the local FortiGate) would still see the outbound packets generated by the FortiGate trying to initiate the connection. "No output" implies the local device isn't even generating packets matching that filter.
* D: Mismatched IKE versions would still generate IKE negotiation packets (proposals/errors) that would be captured by the sniffer.
Reference:
FortiGate Security 7.6 Study Guide (IPsec VPN): "IKEv2 over TCP is available for environments where UDP 500/4500 is blocked. When enabled, IKE and ESP packets are encapsulated in TCP headers."


NEW QUESTION # 24
Refer to the exhibit.

Which two statements about the output are true, considering NGFW-1 and NGFW-2 have been up for a week? (Choose two.)

Answer: C,D

Explanation:
The correct answers are A and B.
The exhibit shows:
override: disable
both members are currently in-sync
only port7 appears under HBDEV stats, so it is the active heartbeat interface the cluster is in HA A-P mode Why A is correct:
With override disabled, after a failover the new primary keeps that role when the old primary comes back. The FortiOS administration guide states:
"When the primary FortiGate rejoins the cluster the secondary FortiGate continues to operate as the primary FortiGate." So if FGVM...649 reboots and FGVM...650 becomes primary, FGVM...650 will remain primary after FGVM...649 rejoins.
Why B is correct:
The study guide states:
"When FortiGate devices configured in an HA cluster lose communication with each other on the heartbeat interface, each FortiGate assumes the role of the primary device." The exhibit shows only port7 as the heartbeat device in HBDEV stats So if port7 is disconnected and heartbeat communication is lost, the cluster can enter a split-brain condition, where both units believe they are primary. The FortiOS administration guide confirms the same behavior: loss of heartbeat communication causes each member to think it is the primary Why the other options are wrong:
C is wrong because configuration synchronization status is specifically used to detect whether secondary members remain synchronized with the primary. If members are no longer synchronized, the status changes from in-sync to out-of-sync D is wrong because the study guide explains that during a configuration change, checksums may differ briefly while changes are copied, but it does not describe this as the secondary initiating a "synchronization reset" So the verified answers are: A, B.


NEW QUESTION # 25
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