Fortinet Network Security Expert 4 Written Exam (400) - NSE4

Fortinet NSE4 test insides dumps
  • Exam Code: NSE4
  • Exam Name: Fortinet Network Security Expert 4 Written Exam (400)
  • Updated: Jun 20, 2026
  • Q & A: 303 Questions and Answers
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Fortinet Network Security Expert 4 Written Exam (400) Sample Questions:

1. Which of the following statements describes the objectives of the gratuitous ARP packets sent by an HA cluster?

A) To notify the master unit that the slave devices are still up and alive.
B) To notify the master unit about the physical MAC addresses of the slave units.
C) To notify the network switches that a new HA master unit has been elected.
D) To synchronize the ARp tables in all the FortiGate Unis that are part of the HA cluster.


2. A FortiGate devices is configured with four VDOMs: 'root' and 'vdom1' are in NAT/route mode; 'vdom2' and 'vdom2' are in transparent mode. The management VDOM is 'root'.
Which of the following statements are true? (Choose two.)

A) An inter-VDOM link between 'root' and 'vdom1' can be created.
B) An inter-VDOM link between 'vdom2' and vdom3' can created.
C) An inter-VDOM link between 'vdom1' and vdom2' can created.
D) Inter-VDOM link links must be manually configured for FortiGuard traffic.


3. If you have lost your password for the "admin" account on your FortiGate, how should you reset it?

A) Reboot the FortiGate. Via the local console, during the boot loader, use the menu to log in as "maintainer" and enter the CLI commands to set the password for the "admin" account.
B) Reboot the FortiGate. Via the local console, during the boot loader, use the menu to format the flash disk and reinstall the firmware. Then you can log in with the default password.
C) Power off the FortiGate. After several seconds, restart it. Via the local console, within 30 seconds after booting has completed, log in as "maintainer" and enter the CLI commands to set the password for the "admin" account.
D) Log in with another administrator account that has "super_admin" profile permissions, then reset the password for the "admin" account.


4. A FortiGate unit operating in NAT/route mode and configured with two sub-interface on the same physical interface. Which of the following statement is correct regarding the VLAN
IDs in this scenario?

A) The two VLAN sub-interfaces can have the same VLAN IDs only if they have IP addresses in different subnets.
B) The two VLAN sub-interfaces can have the same VLAN if they are connected to different L2 IEEE 802.1Q complaint switches.
C) The two VLAN sub-interfaces can have VLAN ID only if they belong to different VDOMs.
D) The two VLAN sub-interfaces must have different VLAN IDs.


5. Which best describes the authentication timeout?

A) How long an authenticated user can be idle (without sending traffic) before they must authenticate again.
B) How long a user is allowed to send and receive traffic before he or she must authenticate again.
C) How long a user-authenticated session can exist without having to authenticate again.
D) How long FortiGate waits for the user to enter his or her credentials.


Solutions:

Question # 1
Answer: C
Question # 2
Answer: A,C
Question # 3
Answer: C
Question # 4
Answer: D
Question # 5
Answer: A

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