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Fortinet NSE4_FGT_AD-7.6 Prüfungsplan:

Thema Einzelheiten
Thema 1
  • VPN: This domain focuses on implementing meshed or partially redundant IPsec VPN topologies for secure connections.
Thema 2
  • Routing: This domain covers configuring static routes for packet forwarding and implementing SD-WAN to load balance traffic across multiple WAN links.
Thema 3
  • Content Inspection: This domain addresses inspecting encrypted traffic using certificates, understanding inspection modes and web filtering, configuring application control, deploying antivirus scanning modes, and implementing IPS for threat protection.
Thema 4
  • Deployment and System Configuration: This domain covers initial FortiGate setup, logging configuration and troubleshooting, FGCP HA cluster configuration, resource and connectivity diagnostics, FortiGate cloud deployments (CNF and VM), and FortiSASE administration with user onboarding.
Thema 5
  • Firewall Policies and Authentication: This domain focuses on creating firewall policies, configuring SNAT and DNAT for address translation, implementing various authentication methods, and deploying FSSO for user identification.

 

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Fortinet NSE 4 - FortiOS 7.6 Administrator NSE4_FGT_AD-7.6 Prüfungsfragen mit Lösungen (Q24-Q29):

24. Frage
Refer to the exhibit.

What can you conclude from the log shown in the exhibit?

  • A. The IPS socket buffer is full and IPS engine needs more memory to create new sessions.
  • B. The IPS socket buffer is full and IPS engine cannot decode a packet.
  • C. The IPS session scan is paused and reevaluating the packet because of a dirty flag.
  • D. The IPS scan is paused by the IPS diagnostic command with bypass mode option 5.

Antwort: A

Begründung:
"You can configure the fail-open setting under config ips global to control how the IPS engine behaves when the IPS socket buffer is full."
"If the IPS engine does not have enough memory to build more sessions, the fail-open setting determines whether the FortiGate should drop the sessions or bypass the sessions without inspection."
"It is important to understand that the IPS fail-open setting is not just for conserve mode-it kicks in whenever IPS fails. Most failures are due to a high CPU issue or a high memory (conserve mode) issue." Technical Deep Dive:
The correct answer is A.
The log text says:
logdesc="IPS session scan paused"
action="drop"
msg="IPS session scan, enter fail open mode"
That combination indicates an IPS failure condition, specifically the condition described in the guide where the IPS socket buffer is full and the IPS engine lacks enough memory/resources to build additional sessions. In that state, FortiGate applies the configured IPS fail-open behavior. Since the log shows action="drop", the device is not bypassing those new sessions; it is dropping them.
Why the other choices are wrong:
B is wrong because the guide ties fail-open to socket buffer/resource exhaustion, not packet decode failure.
C is wrong because this is not evidence of a manual diagnostic pause.
D is wrong because the study guide does not associate this log with dirty-flag packet reevaluation.
Operationally, this usually points to high memory, high CPU, or conserve-mode pressure affecting the IPS engine. Useful checks are:
get system performance status
diagnose hardware sysinfo conserve
diagnose sys top
Those help confirm whether the IPS issue is being driven by memory pressure or CPU exhaustion.

 

25. Frage
Refer to the exhibit.
A partial cloud topology is shown.

You deployed a FortiGate Cloud-Native Firewall (CNF) in AWS.
During the deployment, which components must the FortiGate CNF create to handle traffic from the EC2 instance?

  • A. The gateway load balancer endpoint (GWLBe) in the customer virtual private cloud (VPC)
  • B. The customer VPC and GWLBe
  • C. The CNF VPC. customer VPC. and GWLB
  • D. The GWLB. GWLBe, and the internet gateway (IGW) in the customer VPC

Antwort: A

Begründung:
In the FortiGate Cloud-Native Firewall (CNF) for AWS architecture, traffic from workloads (such as an EC2 instance) in the customer VPC is redirected to the security service (FortiGate CNF) using AWS Gateway Load Balancer (GWLB) technology.
The key AWS component that must exist inside the customer VPC to steer workload traffic to the GWLB is the:
Gateway Load Balancer Endpoint (GWLBe)
This endpoint is what the customer VPC routes point to (for example, default route or subnet route entries), enabling transparent insertion of the FortiGate CNF inspection path for EC2 traffic.
Why the other options are not correct:
A: CNF does not "create the customer VPC" (that is customer-owned), and "GWLBe" is the only relevant created item here, not the whole VPC.
C: Customer VPC is not created by CNF, and GWLB is typically part of the CNF service side; the question specifically asks what must be created to handle traffic from the EC2 instance (that requires GWLBe in the customer VPC).
D: CNF does not create the Internet Gateway (IGW) in the customer VPC, and IGW is not the required CNF-created component for steering traffic to FortiGate CNF.

 

26. Frage
Refer to the exhibits.

The system performance output and default configuration of high memory usage thresholds on a FortiGate device are shown.
Based on the system performance output, what are the two possible outcomes? (Choose two.)

  • A. FortiGate has entered conserve mode.
  • B. Administrators can access FortiGate only through the console port.
  • C. Administrators can change the configuration.
  • D. FortiGate drops new sessions.

Antwort: A,C

Begründung:
From the exhibits:
System performance output
Memory used: 90%
Free memory: ~5%
Default memory thresholds (FortiOS 7.6)
memory-use-threshold-green 82%
memory-use-threshold-red 88%
memory-use-threshold-extreme 89%
Because memory usage (90%) exceeds the extreme threshold (89%), the FortiGate enters conserve mode.
Effects of conserve mode (FortiOS 7.6 - verified)
B . FortiGate has entered conserve mode.
Correct
When memory usage exceeds the red/extreme threshold, FortiGate automatically enters conserve mode.
This is exactly the condition shown in the system performance output.
D . Administrators can change the configuration.
Correct
Even in conserve mode:
Administrators can still log in (GUI, SSH, console)
Configuration changes are allowed
FortiGate does not lock configuration access during conserve mode.
This behavior is explicitly documented in the FortiOS 7.6 Conserve Mode section.
Why the other options are incorrect
A . Administrators can access FortiGate only through the console port.
Incorrect
Network access (GUI/SSH) is still available in conserve mode unless otherwise restricted.
Console-only access is not a conserve-mode requirement.
C . FortiGate drops new sessions.
Incorrect (as a general statement)
FortiGate may drop or bypass new inspection-required sessions depending on fail-open/fail-close settings.
It does not universally drop all new sessions, so this statement is not always true.

 

27. Frage
Refer to the exhibit
A firewall policy to enable active authentication is shown.

When attempting to access an external website using an active authentication method, the user is not presented with a login prompt. What is the most likely reason for this situation?

  • A. No matching user account exists for this user.
  • B. The Remote-users group is not added to the Destination
  • C. The Remote-users group must be set up correctly in the FSSO configuration.
  • D. The Service DNS is required in the firewall policy.

Antwort: D

Begründung:
Based on the exhibit and FortiOS 7.6 Active Authentication (captive portal) behavior, the most likely reason the user is not presented with a login prompt is that DNS is missing from the firewall policy.
What the exhibit shows
The firewall policy configured for active authentication includes:
Source: HQ_SUBNET and Remote-users
Destination: all
Services:
HTTP
HTTPS
ALL_ICMP
Security Profiles: Web filter and SSL inspection enabled
Authentication: Active (user group referenced)
DNS is not included as a service in the policy.
Why DNS is required for active authentication
In FortiOS 7.6, active authentication (captive portal) works as follows:
The user attempts to access a website using a URL (for example, www.example.com).
The client must first perform a DNS lookup to resolve the domain name.
FortiGate intercepts the initial HTTP/HTTPS request and redirects the user to the authentication portal.
If DNS traffic is blocked or not allowed:
The hostname cannot be resolved.
The HTTP/HTTPS request never properly occurs.
FortiGate has nothing to intercept, so the login prompt is never triggered.
This is explicitly documented in the FortiOS 7.6 Authentication and Captive Portal requirements, which state that DNS must be permitted for captive portal-based authentication to function correctly.
Why the other options are incorrect
A . No matching user account exists for this user
Incorrect.
If the user account did not exist, the login page would still appear, but authentication would fail after credentials are entered.
B . The Remote-users group must be set up correctly in the FSSO configuration Incorrect.
This policy is using active authentication, not FSSO.
FSSO configuration is irrelevant for active authentication login prompts.
C . The Remote-users group is not added to the Destination
Incorrect.
User groups are applied in the Source field for authentication-based policies.
Destination does not accept user groups.

 

28. Frage
Refer to the exhibit, which shows an SD-WAN zone configuration on the FortiGate GUI.

Based on the exhibit, which statement is true?

  • A. port2 and port3 are not assigned to a zone.
  • B. The Underlay zone contains no member.
  • C. The Underlay zone is the zone by default.
  • D. The virtual-wan-link and overlay zones can be deleted.

Antwort: B

Begründung:
Underlay is not a default zone. It is user defined and not active.

 

29. Frage
......

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