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Fortinet FCSS_NST_SE-7.6 Exam Syllabus Topics:

TopicDetails
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
  • 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 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
  • 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 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 (Q108-Q113):

NEW QUESTION # 108
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: A,C

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.
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.
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 # 109
Refer to the exhibit, which shows the partial output of a diagnose command.

Which two conclusions can you draw from the output shown in the exhibit? (Choose two.)

Answer: A,B


NEW QUESTION # 110
Exhibit.

Refer to the exhibit, which shows a FortiGate configuration.
An administrator is troubleshooting a web filter issue on FortiGate. The administrator has configured a web filter profile and applied it to a policy; however the web filter is not inspecting any traffic that is passing through the policy.
What must the administrator do to fix the issue?

Answer: C

Explanation:
The exhibit shows a FortiGate configuration under config system fortiguard related to web filtering and FortiGuard options. There is a line:
set webfilter-force-off enable
According to official Fortinet documentation, the "webfilter-force-off" option, when enabled, causes the FortiGate to bypass web filtering for all traffic-even if a web filter profile is applied to a policy.
This override is typically used for troubleshooting or performance reasons and is documented as an explicit bypass feature.
If an administrator wants to enforce web filtering inspection, this setting must be disabled. The correct way to restore web filtering functionality is to run:
set webfilter-force-off disable
Once done, traffic passing through policies with web filter profiles will be inspected and filtered as per configuration. Other settings such as timeout or cache TTL do not bypass web filtering; they only affect operational nuances.
Reference:
FortiOS Administration Guide: Web Filtering, FortiGuard Options, "webfilter-force-off" CLI


NEW QUESTION # 111
Which two statements about an auxiliary session ate true? (Choose two.)

Answer: B,D

Explanation:
Auxiliary sessions in Fortinet are designed to support ECMP (Equal Cost Multi-Path) and SD-WAN scenarios, allowing sessions to be handled efficiently when traffic needs to be dynamically distributed across multiple links. With the auxiliary session setting enabled, FortiGate creates additional session table entries for each possible path in ECMP or SD-WAN-meaning that if the routing path changes (such as a link failover), a new session can be immediately activated and offloaded to the NP6 network processor for acceleration, ensuring minimal disruption. This greatly benefits high-throughput deployments.
Official documentation specifies that when auxiliary sessions are enabled, FortiGate doesn't just rely on dynamically creating new sessions after a routing event, it proactively creates sessions for all potential paths. This means that in the event of a route change, two sessions exist and the traffic is quickly re-routed and offloaded, maximizing performance and reliability. Without this feature, multiple paths cannot be efficiently offloaded, and routing changes trigger a single session update, reducing failover performance.
References:
FortiOS Handbook: Session Table, ECMP, SD-WAN, and Auxiliary Sessions
FortiGate NP6 Acceleration Guide: Auxiliary Session Behavior


NEW QUESTION # 112
Refer to the exhibit.

Which three pieces of information does the diagnose sys top command provide? (Choose three.)

Answer: B,D,E


NEW QUESTION # 113
......

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