P.S. VCESoft在Google Drive上分享了免費的2026 Fortinet FCSS_NST_SE-7.6考試題庫：https://drive.google.com/open?id=1GJFmKi1h8N851rc-geNyahcI9hggVQZP
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| Section | Objectives |
|---|---|
| Security Profiles | - Troubleshoot web filtering issues - Troubleshoot FortiGuard issues - Troubleshoot the intrusion prevention system (IPS) |
| VPNs | - Troubleshoot IPsec IKE version 1 and 2 |
| Routing | - Troubleshoot routing packets using static routes, policy routes, and OSPF |
| System Troubleshooting | - Troubleshoot resource problems using built-in tools - Troubleshoot automation stitches - Troubleshoot Security Fabric and FortiOS connectivity - Troubleshoot HA - Troubleshoot connectivity problems using built-in tools |
| FortiManager | - Troubleshoot FortiManager HA - Troubleshoot policy and object management - Troubleshoot device-level and ADOM-level issues |
| Authentication | - Troubleshoot local and remote authentication - Troubleshoot Fortinet Single Sign-On (FSSO) |
| FortiAnalyzer | - Troubleshoot device and communication issues - Troubleshoot logs and reports |
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問題 #94
Refer to the exhibits.
An OSPF peer is advertising route 172.16.52.0/24. The local FortiGate is configured with an inbound distribution list that allows the 172.16.0.0/16 network to be injected into its routing table. However, the
1'2.16.52.0/24 subnet cannot be seen in the FIB.
Which two stops can the administrator of the local FortiGate take to ensure that the advertised 172.16. 52.0/24 subnet will be injected into the routing table? (Choose two.)
答案：A,D
解題說明：
The issue is caused by the strict matching logic of the configured Prefix List.
Current State: The rule is edit 1 with set prefix 172.16.0.0 255.255.0.0 and both ge (greater than or equal) and le (less than or equal) are unset.
Behavior: When ge and le are unset, FortiOS requires an exact match of the subnet mask. The current rule only matches the exact network 172.16.0.0/16. It denies 172.16.52.0/24 because the mask (/24) does not match the rule's mask (/16).
To fix this and inject 172.16.52.0/24, you must modify the list to match the /24 mask:
A). Add another entry to the prefix list to specifically allow the 172.16.52.0/24 network:
Creating a new rule (e.g., edit 2) with set prefix 172.16.52.0 255.255.255.0 will provide an exact match for the incoming route, allowing it to pass the distribute-list.
B). Change the ge value to 17:
By configuring set ge 17 on the existing rule (conceptually 172.16.0.0/16 ge 17), you change the logic from
"exact match" to "range match".
This configuration tells the router to match any prefix starting with 172.16.x.x that has a subnet mask length of 17 or greater.
Since the incoming route is a /24, and 24 is greater than 17, the route will match the prefix list and be accepted.
Why other options are incorrect:
C: The option text appears to read "Change the ... value to 16". If this refers to le 16, it would enforce the mask to be exactly /16 or less, which still excludes /24.
D: Changing the default behavior to implicit allow defeats the purpose of a filter (security control) and is not a standard configuration step for fixing a single missing route.
Reference:
FortiGate Security 7.6 Study Guide (Routing): "In prefix-lists, if ge and le are not used, the subnet mask must match exactly. To match subnets within a range, you must define the prefix length boundaries using ge or le."
問題 #95
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?
答案：C
解題說明：
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.
問題 #96
Refer to the exhibit.
An administrator has configured a firewall policy to use proxy-based inspection mode. What could explain the messages observed in the debug flow output?
答案：A
解題說明：
The correct answer is A .
The debug flow shows:
* traffic is going to TCP port 211
* FortiGate logs run helper-ftp(dir=original)
The study guide explains exactly what that message means:
"In this example, the run helper-ftp message indicates that the FTP session helper is being used." Under normal proxy-based inspection, protocol handling is controlled by Protocol Options . The FortiOS administration guide states:
"Protocol port mapping only works with proxy-based inspection." and "The ports can be modified to inspect any port with flowing traffic." So if the policy is configured for proxy-based inspection but the debug still shows the FTP session helper on port 211, the most likely explanation is that the FTP protocol mapping in Protocol Options is broad enough to match unexpectedly, such as being mapped to Any . That would cause FortiGate to identify the traffic as FTP and invoke the helper.
Why the other options are wrong:
* B is wrong because SSL deep inspection is unrelated to this debug. The traffic shown is plain TCP/211
, and the key message is about the FTP helper , not SSL decryption.
* C is wrong because if FTP had not been mapped to port 211, FortiGate would be less likely to treat this traffic as FTP. The observed run helper-ftp indicates FTP handling is being triggered.
* D is wrong because low-memory conserve behavior would typically cause inspection bypass or blocking behavior, not specifically the run helper-ftp message. The study guide's helper example ties this message to session-helper use, not memory shortage.
So the verified answer is: A .
問題 #97
Refer to the exhibit, which shows partial outputs from two routing debug commands.
Why is the port2 default route not in the second command output?
答案：C
解題說明：
The correct answer is D.
In the exhibit, get router info routing-table database shows both static default routes:
0.0.0.0/0 [20/0] via 100.64.2.254, port2
0.0.0.0/0 [10/0] via 100.64.1.254, port1
But get router info routing-table all shows only:
0.0.0.0/0 [10/0] via 100.64.1.254, port1
The study guide explains that get router info routing-table all displays the routes that make it to the FIB - the best active routes. It also says that this command doesn't show standby or inactive routes, which can remain only in the routing table database. It gives the exact rule: "when two static routes to the same destination subnet have different distances, the one with the lower distance is installed in the routing table, and the one with the higher distance is installed in the routing table database." The study guide also shows the route selection process:
Most specific route
Lowest distance
Lowest metric (dynamic routes)
Lowest priority (static routes)
ECMP
So the port2 default route is absent from the second output because its distance is 20, while the port1 default route has distance 10. The lower-distance route is installed in the active routing table/FIB.
Why the other options are wrong:
A is wrong because the exhibit does not indicate port2 is down or disabled.
B and C are wrong because priority is checked only after distance for static routes. Here, the routes already differ by distance, so priority is not the deciding factor.
So the verified answer is: D.
問題 #98
Refer to the exhibit.
The output of a BGO debug command is shown.
What is the most likely reason that the local FortiGate is not receiving any prefixes from its neighbors?
答案：D
解題說明：
To identify the reason for the lack of prefixes, we must interpret the State/PfxRcd and Up/Down columns in the get router info bgp summary exhibit.
Analyze Neighbor Status:
Neighbor 10.125.0.60: State is OpenSent. This session is not established. It is stuck in the negotiation phase.
Neighbor 100.64.3.1: State is Active. This session is not established. The router is actively trying to initiate a TCP connection.
Neighbor 10.127.0.75:
Up/Down: 02:45:55. This indicates the BGP session has been Up (Established) for almost 3 hours.
State/PfxRcd: 0. This number represents the count of prefixes received. The session is fully established, but the neighbor has sent zero routes.
Determine the Cause:
Since the session with 10.127.0.75 is established, connectivity and handshakes (Options A, B, C) are not the issue for this neighbor.
The fact that it is Up but sending 0 prefixes strongly implies that the neighbor is configured to filter out its routes before sending them to the local FortiGate.
Option D correctly identifies this as a RIB-OUT (Routing Information Base - Outbound) configuration issue on the neighbor (Router 10.127.0.75), which prevents it from advertising its routes.
Reference:
FortiGate Security 7.6 Study Guide (BGP): " In the BGP summary, if the State/PfxRcd shows a number (e.g.,
0), the session is Established. A value of 0 means the peering is up, but no routes have been received, often due to route-map or prefix-list filtering on the remote peer. "
問題 #99
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FCSS_NST_SE-7.6考試指南: https://www.vcesoft.com/FCSS_NST_SE-7.6-pdf.html
此外，這些VCESoft FCSS_NST_SE-7.6考試題庫的部分內容現在是免費的：https://drive.google.com/open?id=1GJFmKi1h8N851rc-geNyahcI9hggVQZP